This number is a prime.

+ The only 5-digit palindromic prime that is undulating and the sum of 3 consecutive primes (31643 + 31649 + 31657). Note that by adding 3 consecutive primes we only get one other undulating palindrome (16161), which is a non-prime. [Trotter]

+ A palindromic prime that can be expressed as a sum of powers with the four prime digits as bases and exponents (2^3 + 3^2 + 5^7 + 7^5). [Silva]

+ Replacing each digit by its square root, or subtracting 2 from each digit, you will have two other palindromic primes formed from prime digits (32323, 72727). [Silva]

+ The largest 5-digit palindromic prime whose digits are perfect squares. Coincidentally, it's the ZIP Code of Novato, California. [Silva]

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