315531 has 6 divisors (see below), whose sum is σ = 455780. Its totient is φ = 210348.

The previous prime is 315529. The next prime is 315547. The reversal of 315531 is 135513.

It is a happy number.

It is not a de Polignac number, because 315531 - 2¹ = 315529 is a prime.

It is a super-2 number, since 2×315531² = 199119623922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (315521) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 17521 + ... + 17538.

2³¹⁵⁵³¹ is an apocalyptic number.

315531 is a deficient number, since it is larger than the sum of its proper divisors (140249).

315531 is a wasteful number, since it uses less digits than its factorization.

315531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35065 (or 35062 counting only the distinct ones).

The product of its digits is 225, while the sum is 18.

The square root of 315531 is about 561.7214612243. The cubic root of 315531 is about 68.0791322142.

Subtracting from 315531 its sum of digits (18), we obtain a palindrome (315513).

The spelling of 315531 in words is "three hundred fifteen thousand, five hundred thirty-one".