317891 has 4 divisors (see below), whose sum is σ = 363312. Its totient is φ = 272472.

The previous prime is 317887. The next prime is 317903. The reversal of 317891 is 198713.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 198713 = 17 ⋅11689.

It is a cyclic number.

It is not a de Polignac number, because 317891 - 2² = 317887 is a prime.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 317891.

It is not an unprimeable number, because it can be changed into a prime (317831) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22700 + ... + 22713.

It is an arithmetic number, because the mean of its divisors is an integer number (90828).

2³¹⁷⁸⁹¹ is an apocalyptic number.

317891 is a deficient number, since it is larger than the sum of its proper divisors (45421).

317891 is an equidigital number, since it uses as much as digits as its factorization.

317891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45420.

The product of its digits is 1512, while the sum is 29.

The square root of 317891 is about 563.8182331213. The cubic root of 317891 is about 68.2484424052.

The spelling of 317891 in words is "three hundred seventeen thousand, eight hundred ninety-one".