312631 has 8 divisors (see below), whose sum is σ = 345744. Its totient is φ = 280320.

The previous prime is 312623. The next prime is 312643. The reversal of 312631 is 136213.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 312631 - 2³ = 312623 is a prime.

It is a super-2 number, since 2×312631² = 195476284322, 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 (312601) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 921 + ... + 1213.

It is an arithmetic number, because the mean of its divisors is an integer number (43218).

2³¹²⁶³¹ is an apocalyptic number.

312631 is a deficient number, since it is larger than the sum of its proper divisors (33113).

312631 is a wasteful number, since it uses less digits than its factorization.

312631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 401.

The product of its digits is 108, while the sum is 16.

The square root of 312631 is about 559.1341520601. The cubic root of 312631 is about 67.8699214557.

Adding to 312631 its reverse (136213), we get a palindrome (448844).

It can be divided in two parts, 31 and 2631, that added together give a palindrome (2662).

The spelling of 312631 in words is "three hundred twelve thousand, six hundred thirty-one".