3169

This number is a prime.

A.D. 3169 will be the first emirp year heralded, on the ultimate second prior to entering it during the outgoing year's final countdown, by an emirp, namely 12313168235959, i.e., at 12/31/3168/23:59:59, (on December 31, 3168 at precisely 23 hours 59 minutes 59 seconds). [Beedassy]

The smallest emirp that can be represented as the difference of cubes of two successive composite numbers, i.e., 33^3-32^3. [Loungrides]

The only 4-digit emirp with sum of digits equal to the digital sum of its square. [Gaydos]

The smallest emirp formed by using all the digits which can be digital root of triangular numbers. [Gupta]