4049

This number is a prime.

4049 = 9^3 + 8^3 + 7^3 + 6^3 + 5^3 + 4^3 + 3^3 + 2^3 + 1^3 + 2^3 + 3^3 + 4^3 + 5^3 + 6^3 + 7^3 + 8^3 + 9^3. [Silva]

(There are 4 curios for this number that have not yet been approved by an editor.)