811668317 has 2 divisors, whose sum is σ = 811668318. Its totient is φ = 811668316.

The previous prime is 811668293. The next prime is 811668359. The reversal of 811668317 is 713866118.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 443565721 + 368102596 = 21061^2 + 19186^2 .

It is a cyclic number.

It is not a de Polignac number, because 811668317 - 2¹⁴ = 811651933 is a prime.

It is a super-2 number, since 2×811668317² = 1317610913643224978, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (811661317) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 405834158 + 405834159.

It is an arithmetic number, because the mean of its divisors is an integer number (405834159).

Almost surely, 2^811668317 is an apocalyptic number.

It is an amenable number.

811668317 is a deficient number, since it is larger than the sum of its proper divisors (1).

811668317 is an equidigital number, since it uses as much as digits as its factorization.

811668317 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 48384, while the sum is 41.

The square root of 811668317 is about 28489.7932073927. The cubic root of 811668317 is about 932.8092942438.

The spelling of 811668317 in words is "eight hundred eleven million, six hundred sixty-eight thousand, three hundred seventeen".