One Million Primes

This app will check any number you enter to see if it is prime (up to 239 trillion). If a number you check is not prime, One Million Primes will list the prime factorization of that number. One Million Primes will also list primes by index (e.g. the 567,000th prime) and up to 50 primes before and after. It will also list up to 50 primes underneath a given number (e.g. list all primes under 100). Please rate and review, this is my first app.