317217653681 has 2 divisors, whose sum is σ = 317217653682. Its totient is φ = 317217653680.

The previous prime is 317217653653. The next prime is 317217653689. The reversal of 317217653681 is 186356712713.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 316789991281 + 427662400 = 562841^2 + 20680^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-317217653681 is a prime.

It is a super-2 number, since 2×317217653681² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (317217653689) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 158608826840 + 158608826841.

It is an arithmetic number, because the mean of its divisors is an integer number (158608826841).

Almost surely, 2^317217653681 is an apocalyptic number.

It is an amenable number.

317217653681 is a deficient number, since it is larger than the sum of its proper divisors (1).

317217653681 is an equidigital number, since it uses as much as digits as its factorization.

317217653681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1270080, while the sum is 50.

The spelling of 317217653681 in words is "three hundred seventeen billion, two hundred seventeen million, six hundred fifty-three thousand, six hundred eighty-one".