317639857 has 16 divisors (see below), whose sum is σ = 338038272. Its totient is φ = 297941760.

The previous prime is 317639851. The next prime is 317639873. The reversal of 317639857 is 758936713.

It is not a de Polignac number, because 317639857 - 2²³ = 309251249 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 317639857.

It is not an unprimeable number, because it can be changed into a prime (317639851) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 535353 + ... + 535945.

It is an arithmetic number, because the mean of its divisors is an integer number (21127392).

Almost surely, 2^317639857 is an apocalyptic number.

317639857 is a gapful number since it is divisible by the number (37) formed by its first and last digit.

It is an amenable number.

317639857 is a deficient number, since it is larger than the sum of its proper divisors (20398415).

317639857 is a wasteful number, since it uses less digits than its factorization.

317639857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1128.

The product of its digits is 952560, while the sum is 49.

The square root of 317639857 is about 17822.4537311785. The cubic root of 317639857 is about 682.3046492835.

The spelling of 317639857 in words is "three hundred seventeen million, six hundred thirty-nine thousand, eight hundred fifty-seven".