1300031

This number is a prime.

The smallest palindromic prime that is formed from two emirps separated by a prime number of central zeros. [Beedassy]

The smallest palindromic prime formed from a central digit repeated between emirps. [Silva]

The smallest palindromic prime of the form 13*10^(k+2)+31, where k is the number of zeros between 13 and 31. [Honaker]