31139

This number is a prime.

31139 = (π(3!) + π(1!) + π(1!) + π(3!) + π(9!)) + (π(3!₂) + π(1!₂) + π(1!₂) + π(3!₂) + π(9!₂)). Note that prime 31139 is the only odd number with this property. [Firoozbakht]