818

This number is a composite.

+ 818 is the smallest palindrome that may be expressed as the sum of the squares of two primes (232 + 172). [King]

+ 818 is the only 3-digit tetradic integer such that the sum of the differences of the number and each digit raised to the digit is prime. I.e., (818-8)^8+(818-1)^1+(818-8)^8 is prime. [Opao]

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