317320631 has 2 divisors, whose sum is σ = 317320632. Its totient is φ = 317320630.

The previous prime is 317320571. The next prime is 317320637. The reversal of 317320631 is 136023713.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 317320631 - 2⁶ = 317320567 is a prime.

It is a super-2 number, since 2×317320631² = 201384765716476322, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 317320631.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (317320637) 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, 158660315 + 158660316.

It is an arithmetic number, because the mean of its divisors is an integer number (158660316).

Almost surely, 2^317320631 is an apocalyptic number.

317320631 is a deficient number, since it is larger than the sum of its proper divisors (1).

317320631 is an equidigital number, since it uses as much as digits as its factorization.

317320631 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2268, while the sum is 26.

The square root of 317320631 is about 17813.4957546238. The cubic root of 317320631 is about 682.0760020849.

The spelling of 317320631 in words is "three hundred seventeen million, three hundred twenty thousand, six hundred thirty-one".