This app checks each phone number in your contacts list and tells you which ones which are prime numbers.

It will also give you all of the prime factors (numbers which divide into) for any number up to 14 digits.



If you tap on a name, it allows you to send either SMS messages (for Mobile numbers) or emails (for others) to send the contact a message, and tell the person that they have a prime number phone number. Some people may be more interested than others...