316663681 has 2 divisors, whose sum is σ = 316663682. Its totient is φ = 316663680.

The previous prime is 316663657. The next prime is 316663693. The reversal of 316663681 is 186366613.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 225270081 + 91393600 = 15009^2 + 9560^2 .

It is a cyclic number.

It is not a de Polignac number, because 316663681 - 2⁷ = 316663553 is a prime.

It is a super-2 number, since 2×316663681² = 200551773728939522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (316663601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 158331840 + 158331841.

It is an arithmetic number, because the mean of its divisors is an integer number (158331841).

Almost surely, 2^316663681 is an apocalyptic number.

It is an amenable number.

316663681 is a deficient number, since it is larger than the sum of its proper divisors (1).

316663681 is an equidigital number, since it uses as much as digits as its factorization.

316663681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 93312, while the sum is 40.

The square root of 316663681 is about 17795.0465298633. The cubic root of 316663681 is about 681.6049754437.

The spelling of 316663681 in words is "three hundred sixteen million, six hundred sixty-three thousand, six hundred eighty-one".