This number is a prime.
A prime number with distinct digits, each of which is a primitive root modulo that prime. There are only six such numbers and this one is the largest (the others are 53, 827, 2357, 6827, and 8237). [Vantieghem]
Printed from the PrimePages <t5k.org> © G. L. Honaker and Chris K. Caldwell