This number is a prime.

                                                            31335 3373353313

+ The smallest odd-digit palindromic prime P of the form abcba, where a, b, c are three consecutive multi-digit palindromic primes: (313, 353, 373). Curiously, P is expressible as the sum of two squares: (15499503^2 + 8550952^2). [Bajpai]

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