31000231312 has 20 divisors (see below), whose sum is σ = 62674381440. Its totient is φ = 14826197408.

The previous prime is 31000231277. The next prime is 31000231369. The reversal of 31000231312 is 21313200013.

It is a super-2 number, since 2×31000231312² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42119512 + ... + 42120247.

It is an arithmetic number, because the mean of its divisors is an integer number (3133719072).

Almost surely, 2^31000231312 is an apocalyptic number.

It is an amenable number.

31000231312 is an abundant number, since it is smaller than the sum of its proper divisors (31674150128).

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

31000231312 is a wasteful number, since it uses less digits than its factorization.

31000231312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84239790 (or 84239784 counting only the distinct ones).

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

Adding to 31000231312 its reverse (21313200013), we get a palindrome (52313431325).

The spelling of 31000231312 in words is "thirty-one billion, two hundred thirty-one thousand, three hundred twelve".