272

This number is a composite.

A palindromic prime-digit composite whose sum of the digits is a palindromic prime. Note that the product of the digits is a perfect number. [Skaflotten]

272² + 272⁷ + 272² + 1 is prime. [Opao]

n⁶ + 272 is composite for all n up to 2162. [Wesolowski]