316813811681 has 2 divisors, whose sum is σ = 316813811682. Its totient is φ = 316813811680.

The previous prime is 316813811599. The next prime is 316813811701. The reversal of 316813811681 is 186118318613.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 289319197456 + 27494614225 = 537884^2 + 165815^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-316813811681 is a prime.

It is a super-2 number, since 2×316813811681² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (316813841681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 158406905840 + 158406905841.

It is an arithmetic number, because the mean of its divisors is an integer number (158406905841).

Almost surely, 2^316813811681 is an apocalyptic number.

It is an amenable number.

316813811681 is a deficient number, since it is larger than the sum of its proper divisors (1).

316813811681 is an equidigital number, since it uses as much as digits as its factorization.

316813811681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 165888, while the sum is 47.

The spelling of 316813811681 in words is "three hundred sixteen billion, eight hundred thirteen million, eight hundred eleven thousand, six hundred eighty-one".