317263806721 has 2 divisors, whose sum is σ = 317263806722. Its totient is φ = 317263806720.

The previous prime is 317263806703. The next prime is 317263806787. The reversal of 317263806721 is 127608362713.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 306986916096 + 10276890625 = 554064^2 + 101375^2 .

It is a cyclic number.

It is not a de Polignac number, because 317263806721 - 2⁵ = 317263806689 is a prime.

It is not a weakly prime, because it can be changed into another prime (317263803721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 158631903360 + 158631903361.

It is an arithmetic number, because the mean of its divisors is an integer number (158631903361).

Almost surely, 2^317263806721 is an apocalyptic number.

It is an amenable number.

317263806721 is a deficient number, since it is larger than the sum of its proper divisors (1).

317263806721 is an equidigital number, since it uses as much as digits as its factorization.

317263806721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 508032, while the sum is 46.

The spelling of 317263806721 in words is "three hundred seventeen billion, two hundred sixty-three million, eight hundred six thousand, seven hundred twenty-one".