Primus - The Prime Number App

Primus is the ultimate prime number generator. It has a simple User Interface and can do six powerful calculations (let's take your number as X):
•Determine if X is prime
•Find the factors of X
•Find the prime factors of X
•Find all the primes up to X
•Find up to the Xth prime
•Find all the primes within a range (X and another number)

More features can be included if suggested!