312531989 has 24 divisors (see below), whose sum is σ = 398208384. Its totient is φ = 240055200.

The previous prime is 312531977. The next prime is 312531991. The reversal of 312531989 is 989135213.

It is not a de Polignac number, because 312531989 - 2⁸ = 312531733 is a prime.

It is a super-2 number, since 2×312531989² = 195352488296592242, which contains 22 as substring.

It is a Smith number, since the sum of its digits (41) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (312531959) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 57539 + ... + 62735.

It is an arithmetic number, because the mean of its divisors is an integer number (16592016).

Almost surely, 2^312531989 is an apocalyptic number.

It is an amenable number.

312531989 is a deficient number, since it is larger than the sum of its proper divisors (85676395).

312531989 is a wasteful number, since it uses less digits than its factorization.

312531989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5297 (or 5286 counting only the distinct ones).

The product of its digits is 58320, while the sum is 41.

The square root of 312531989 is about 17678.5742920633. The cubic root of 312531989 is about 678.6275584267.

The spelling of 312531989 in words is "three hundred twelve million, five hundred thirty-one thousand, nine hundred eighty-nine".