2401

This number is a composite.

+ 2401 = (2+4+0+1)^pi(2+4+0+1). It is the smallest multidigit number with this property and there exists only one larger such number. [Firoozbakht]

+ Smallest fourth power that becomes prime when its most significant (or left-most) digit is deleted. The next is 279841. [Post]

Printed from the PrimePages <primes.utm.edu> © G. L. Honaker and Chris K. Caldwell