# Primes and Prime Factors App > App for checking primality and finding prime factors of large numbers. (iPhone/iPad app by Henning Poulsen.) - Source: https://appshunter.io/ios/app/primes-and-prime-factors-app/id796307644 (this page in markdown: same URL + `.md`) - Developer: [Henning Poulsen](https://appshunter.io/developer/795909179) - Category: Education, Utilities - Price: Free - Rating: 4.30/5 from 23 App Store ratings · 4 written reviews indexed - Age rating: 4+ - Requires: iOS 8.0 · 2 MB - Languages: American English, Arabic, Catalan, Croatian, Czech, Danish, Dutch, Faroese, Finnish, French (France) and 24 more - Released: 2014-01-17 - Data updated: 2026-08-15 - Monetization: free - User reviews in markdown: https://appshunter.io/ios/app/primes-and-prime-factors-app/id796307644/reviews.md ## What is Primes and Prime Factors App? Primes, Prime Factors About This app lets you • check numbers to see if they are prime numbers, • find next prime, • find primes within an interval (range), and • determining prime factors. The input numbers need be between 0 and 9,223,372,036,854,775,807, which is 2^63-1, or approximately 9.223·10^18. Just keep numbers less than 19 digits; a validation mechanism prevents illegal input. Primes A prime number (or a prime) is a natural number greater than 1 that has no positive divisors other than 1 and itself. Examples: 2, 3, 5, 7, 11, 13, 17. 2 is the only even prime. When finding primes in an interval, duration is shown, so the app may be used for benchmarking as well. Prime factor A natural number greater than 1 that is not a prime number is called a composite number. Enter any number into the Factor field, to get its prime factors. If the number is a prime, then it has only one factor, itself. Examples: •Entering 6, gives 2 3. •Entering 12, gives 2 2 3. •Entering 100, gives 2 2 5 5. Since very big numbers may consist of many small primes, prime factorization of large numbers may be very quick. Try it out. Duration is shown. Localization/Translation I have tried to translate this app into every language imaginable, but I have used an online translation service for most of them, and as you know, words may have different meanings. Please do not hesitate to email me, if you have any corrections to the translations, or just any tips or criticism to this app. I will read every mail — if it is written in English :) ## Key features - Check if numbers are prime - Find the next prime number - Find primes within a range - Determine prime factors - Benchmarking with duration display - Supports large number inputs ## Recent user reviews (4 of 4) All indexed reviews: https://appshunter.io/ios/app/primes-and-prime-factors-app/id796307644/reviews.md ### 5/5 — 不错的软件，最大18位 *2021-05-09* 希望增加位数，完善因式分解功能。 ### 5/5 — Does exactly what I needed! *2017-04-03* Thank you, it's precisely what I needed for the project I'm working on. Would be nice to be able to buy the adverts away. Would also be nice to see a more visual display. Perhaps a slideable number line. I'm not using it for heavy duty maths or coding, just to explore for a short film. All the best. James **Developer response:** Hi James, thank you very much for your review! You are right! There should be an adverts free version, in fact this app ought to be adverts free, which is why I have already released a version that is free and ads-free and it will remain so in the future. As for your other two proposals, a more visual display and slideable number line, to discover prime numbers in another way is interesting, however not in my plans at current. ### 5/5 — Love it *2014-06-15* It's a simple but effective app. Helps me with my child home work. ### 5/5 — Clean and simple *2014-05-26* Does numbers up to 2^64. Has nice extras like next prime and primes in a range. Easy to use. Simple useful output. Needs a previous prime function. Great app that gets the job done ## Frequently asked questions about Primes and Prime Factors App ### What is the maximum number Primes and Prime Factors App can handle? Primes and Prime Factors App can handle input numbers up to 9,223,372,036,854,775,807, which is approximately 9.223 x 10^18. Numbers must be less than 19 digits, and a validation mechanism prevents illegal input. ### How does Primes and Prime Factors App help with learning? The app allows users to check if numbers are prime, find primes within a specified range, and determine the prime factors of any composite number. It also displays calculation durations, which can be useful for understanding computational efficiency. ### Can Primes and Prime Factors App be used offline? The provided data does not specify offline capabilities. However, as a calculation-based tool, it is likely to function without an internet connection once installed. ### What is the update frequency of Primes and Prime Factors App? The app was last updated on November 13, 2017, with version 1.3.2. This indicates a less frequent update schedule, with the last update being several years ago. ### What devices does Primes and Prime Factors App support? Primes and Prime Factors App is supported on iPhone and iPod devices. The age rating is 4+, making it suitable for a wide range of young learners. ### Does Primes and Prime Factors App have ads? No, Primes and Prime Factors App does not contain advertisements. It is a completely free application with no ads to interrupt the user experience. ### How does Primes and Prime Factors App compare to other math apps? This app focuses specifically on prime numbers and factorization, offering detailed calculations and duration tracking for benchmarking. While other math apps may offer broader functionalities, this app excels in its specialized number theory tools. ### What do users like about Primes and Prime Factors App? Based on its 4.3-star rating from 23 reviews, users likely appreciate its straightforward functionality for prime number checks and factorization. The ability to handle large numbers and the clear presentation of results are probable strengths. ## Version history (last 5 releases) ### 1.3.2 — 2017-11-13 This update from Apple will improve the functionality of this app. No new features are included. Bugfixes ### 1.3.1 — 2017-04-10 New: • Ads removed! Celebrate! • If the app asks you to rate or review it, it will now ask you to rate it inside the app instead of take you to the App Store! ### 1.3 — 2016-10-31 Fixed problem related to ads. ### 1.2 — 2016-05-05 Updated to work on iPhone 4 and newer and iOS 8 or newer. ### 1.1 — 2014-01-24 • Updated logo • Stop button added to Factor tab • Stop button reacts quicker ## More apps by Henning Poulsen - [Sun and Moon 3D Planetarium](https://appshunter.io/ios/app/sun-and-moon-3d-planetarium/id1089467675) - [Sun & Moon 3D Planetarium Pro](https://appshunter.io/ios/app/sun-and-moon-3d-planetarium-pro/id1198962475) - [3D Compass - Augmented Reality](https://appshunter.io/ios/app/3d-compass-augmented-reality/id1222154145) All apps by Henning Poulsen: https://appshunter.io/developer/795909179 ## Related topics [prime factorization factorizer](https://appshunter.io/ios/topics/prime-factorization-factorizer) --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-15.*