15017

This number is a prime.

15017 = 1!^2 + 2!^2 + 3!^2 + 4!^2 + 5!^2. [Meller]

15017 = 2 + (3*5*7*11*13). [Wiszowaty]

15017 is the only n-digit prime of the form 1!² + 2!² + ··· + n!². [Ahmed]