317686021 has 16 divisors (see below), whose sum is σ = 349100928. Its totient is φ = 287884800.

The previous prime is 317686013. The next prime is 317686027. The reversal of 317686021 is 120686713.

It is not a de Polignac number, because 317686021 - 2³ = 317686013 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (317686027) 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 in 15 ways as a sum of consecutive naturals, for example, 48841 + ... + 54961.

It is an arithmetic number, because the mean of its divisors is an integer number (21818808).

Almost surely, 2^317686021 is an apocalyptic number.

It is an amenable number.

317686021 is a deficient number, since it is larger than the sum of its proper divisors (31414907).

317686021 is a wasteful number, since it uses less digits than its factorization.

317686021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6252.

The product of its (nonzero) digits is 12096, while the sum is 34.

The square root of 317686021 is about 17823.7487919910. The cubic root of 317686021 is about 682.3377017960.

The spelling of 317686021 in words is "three hundred seventeen million, six hundred eighty-six thousand, twenty-one".