98641

This number is a prime.

The largest prime that contains only distinct positive non-prime digits. [Loungrides]

The largest of four primes that are are all concatenations in reverse order of first n non-prime digits, 1, 4, 6, 8, 9, i.e., for n= 2, 3, 4, 5 respectively, i.e., 41, 641, 8641, 98641. [Loungrides]