318631860517 has 2 divisors, whose sum is σ = 318631860518. Its totient is φ = 318631860516.

The previous prime is 318631860509. The next prime is 318631860529. The reversal of 318631860517 is 715068136813.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 250079006241 + 68552854276 = 500079^2 + 261826^2 .

It is a cyclic number.

It is not a de Polignac number, because 318631860517 - 2³ = 318631860509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (318631860817) 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, 159315930258 + 159315930259.

It is an arithmetic number, because the mean of its divisors is an integer number (159315930259).

Almost surely, 2^318631860517 is an apocalyptic number.

It is an amenable number.

318631860517 is a deficient number, since it is larger than the sum of its proper divisors (1).

318631860517 is an equidigital number, since it uses as much as digits as its factorization.

318631860517 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 725760, while the sum is 49.

The spelling of 318631860517 in words is "three hundred eighteen billion, six hundred thirty-one million, eight hundred sixty thousand, five hundred seventeen".