317992171997 has 2 divisors, whose sum is σ = 317992171998. Its totient is φ = 317992171996.

The previous prime is 317992171963. The next prime is 317992172021. The reversal of 317992171997 is 799171299713.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 309646618681 + 8345553316 = 556459^2 + 91354^2 .

It is a cyclic number.

It is not a de Polignac number, because 317992171997 - 2¹⁶ = 317992106461 is a prime.

It is a super-2 number, since 2×317992171997² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (317992171397) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 158996085998 + 158996085999.

It is an arithmetic number, because the mean of its divisors is an integer number (158996085999).

Almost surely, 2^317992171997 is an apocalyptic number.

It is an amenable number.

317992171997 is a deficient number, since it is larger than the sum of its proper divisors (1).

317992171997 is an equidigital number, since it uses as much as digits as its factorization.

317992171997 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13502538, while the sum is 65.

The spelling of 317992171997 in words is "three hundred seventeen billion, nine hundred ninety-two million, one hundred seventy-one thousand, nine hundred ninety-seven".