3719

This number is a prime.

Just showing those entries submitted by 'Tough': (Click here to show all)

The smallest emirp formed by using all end digits of multidigit primes. [Tough]

Of the 24 permutations of this prime there are 6 more primes - namely 3917, 7193, 1973, 9173, 9371 and 9731. [Tough]