315881 has 2 divisors, whose sum is σ = 315882. Its totient is φ = 315880.

The previous prime is 315857. The next prime is 315883. The reversal of 315881 is 188513.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 235225 + 80656 = 485^2 + 284^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-315881 is a prime.

It is a super-2 number, since 2×315881² = 199561612322, which contains 22 as substring.

Together with 315883, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 315881.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 315881.

It is not a weakly prime, because it can be changed into another prime (315883) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 157940 + 157941.

It is an arithmetic number, because the mean of its divisors is an integer number (157941).

2³¹⁵⁸⁸¹ is an apocalyptic number.

It is an amenable number.

315881 is a deficient number, since it is larger than the sum of its proper divisors (1).

315881 is an equidigital number, since it uses as much as digits as its factorization.

315881 is an evil number, because the sum of its binary digits is even.

The product of its digits is 960, while the sum is 26.

The square root of 315881 is about 562.0329171855. The cubic root of 315881 is about 68.1042949731.

The spelling of 315881 in words is "three hundred fifteen thousand, eight hundred eighty-one".