312531 has 8 divisors (see below), whose sum is σ = 438720. Its totient is φ = 197352.

The previous prime is 312527. The next prime is 312551. The reversal of 312531 is 135213.

It is a happy number.

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

It is not a de Polignac number, because 312531 - 2² = 312527 is a prime.

It is a super-2 number, since 2×312531² = 195351251922, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 312531.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 312531.

It is not an unprimeable number, because it can be changed into a prime (312551) 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, 2685 + ... + 2798.

It is an arithmetic number, because the mean of its divisors is an integer number (54840).

2³¹²⁵³¹ is an apocalyptic number.

312531 is a deficient number, since it is larger than the sum of its proper divisors (126189).

312531 is a wasteful number, since it uses less digits than its factorization.

312531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5505.

The product of its digits is 90, while the sum is 15.

The square root of 312531 is about 559.0447209303. The cubic root of 312531 is about 67.8626842592.

Adding to 312531 its reverse (135213), we get a palindrome (447744).

The spelling of 312531 in words is "three hundred twelve thousand, five hundred thirty-one".