317999991 has 4 divisors (see below), whose sum is σ = 423999992. Its totient is φ = 211999992.

The previous prime is 317999959. The next prime is 318000049. The reversal of 317999991 is 199999713.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 317999991 - 2⁵ = 317999959 is a prime.

It is a super-2 number, since 2×317999991² = 202247988552000162, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (317999951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 52999996 + ... + 53000001.

It is an arithmetic number, because the mean of its divisors is an integer number (105999998).

Almost surely, 2^317999991 is an apocalyptic number.

317999991 is a deficient number, since it is larger than the sum of its proper divisors (106000001).

317999991 is a wasteful number, since it uses less digits than its factorization.

317999991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106000000.

The product of its digits is 1240029, while the sum is 57.

The square root of 317999991 is about 17832.5542477795. The cubic root of 317999991 is about 682.5624132164.

The spelling of 317999991 in words is "three hundred seventeen million, nine hundred ninety-nine thousand, nine hundred ninety-one".