809317057 has 2 divisors, whose sum is σ = 809317058. Its totient is φ = 809317056.

The previous prime is 809317051. The next prime is 809317087. The reversal of 809317057 is 750713908.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 781817521 + 27499536 = 27961^2 + 5244^2 .

It is a cyclic number.

It is not a de Polignac number, because 809317057 - 2⁷ = 809316929 is a prime.

It is a super-2 number, since 2×809317057² = 1309988197502282498, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (809317051) 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, 404658528 + 404658529.

It is an arithmetic number, because the mean of its divisors is an integer number (404658529).

Almost surely, 2^809317057 is an apocalyptic number.

It is an amenable number.

809317057 is a deficient number, since it is larger than the sum of its proper divisors (1).

809317057 is an equidigital number, since it uses as much as digits as its factorization.

809317057 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 52920, while the sum is 40.

The square root of 809317057 is about 28448.4983259222. The cubic root of 809317057 is about 931.9076950742.

The spelling of 809317057 in words is "eight hundred nine million, three hundred seventeen thousand, fifty-seven".