79531

This number is a prime.

The largest distinct-odd-digit deletable emirp, i.e., 79531, 7951, 751, 71, 7 are emirps. [Loungrides]

An emirp consisting of all the distinct odd digits only that can be represented as the sum of an invertible prime number of consecutive invertible primes, i.e., 1109 + 1181 + 1601 + 1609 + 1669 + 1699 + 1811 + 1901 + 1999 + 6011 + 6091 + 6101 + 6199 + 6619 + 6661 + 6689 + 6691 + 6899 + 6991. [Loungrides]