312131020 has 12 divisors (see below), whose sum is σ = 655475184. Its totient is φ = 124852400.

The previous prime is 312130979. The next prime is 312131021. The reversal of 312131020 is 20131213.

It is not an unprimeable number, because it can be changed into a prime (312131021) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7803256 + ... + 7803295.

It is an arithmetic number, because the mean of its divisors is an integer number (54622932).

Almost surely, 2^312131020 is an apocalyptic number.

It is an amenable number.

312131020 is an abundant number, since it is smaller than the sum of its proper divisors (343344164).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

312131020 is a wasteful number, since it uses less digits than its factorization.

312131020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15606560 (or 15606558 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 13.

The square root of 312131020 is about 17667.2301168010. The cubic root of 312131020 is about 678.3372147445.

Adding to 312131020 its reverse (20131213), we get a palindrome (332262233).

The spelling of 312131020 in words is "three hundred twelve million, one hundred thirty-one thousand, twenty".