316618681 has 2 divisors, whose sum is σ = 316618682. Its totient is φ = 316618680.

The previous prime is 316618669. The next prime is 316618691. The reversal of 316618681 is 186816613.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 298978681 + 17640000 = 17291^2 + 4200^2 .

It is an emirp because it is prime and its reverse (186816613) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 316618681 - 2⁷ = 316618553 is a prime.

It is a super-2 number, since 2×316618681² = 200494778316359522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (316618651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 158309340 + 158309341.

It is an arithmetic number, because the mean of its divisors is an integer number (158309341).

Almost surely, 2^316618681 is an apocalyptic number.

It is an amenable number.

316618681 is a deficient number, since it is larger than the sum of its proper divisors (1).

316618681 is an equidigital number, since it uses as much as digits as its factorization.

316618681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 41472, while the sum is 40.

The square root of 316618681 is about 17793.7820881340. The cubic root of 316618681 is about 681.5726870583.

The spelling of 316618681 in words is "three hundred sixteen million, six hundred eighteen thousand, six hundred eighty-one".