This number is a prime.
The smallest palindromic prime formed by concatenating n, n and 1. [Devesh]
The only palindromic prime P that is the sum of the squares of the first n oban numbers, i.e., (3^2 + 5^2 + 6^2 +...+ 39^2 + 50^2), (case n=30). Curiously, sod(P) is the smallest invertible prime. [Bajpai]