786431

This number is a prime.

The largest known distinct-digit prime Thabit number of first kind, i.e., a prime of form 3*2^n-1, (case n=18). [Loungrides]

The largest known Thabit number to be a member of a twin prime pair. [Ray]

The smallest prime p such that p + nextprime(p) is an integer with twenty prime factors, repetitions counted, i.e., 786431+786433 = 1572864 = 2^19*3 [Rivera]