This number is a prime.
The smallest palindromic circular-digit prime. [De Geest]
The first centered triangular number (i.e., of the form the form of (3n2 - 3n + 2)/2) that is a palindromic prime. [Trotter]
The smallest prime that remains prime when inserting one, two, three, four, or five zeros between each digit (908060809, 9008006008009, etc.). [Vrba]