31231311012 has 72 divisors (see below), whose sum is σ = 86531102112. Its totient is φ = 9419155200.

The previous prime is 31231310969. The next prime is 31231311043. The reversal of 31231311012 is 21011313213.

31231311012 is a `hidden beast` number, since 312 + 31 + 311 + 0 + 12 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 103333 + ... + 270444.

Almost surely, 2^31231311012 is an apocalyptic number.

It is an amenable number.

31231311012 is an abundant number, since it is smaller than the sum of its proper divisors (55299791100).

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

31231311012 is a wasteful number, since it uses less digits than its factorization.

31231311012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 374009 (or 374004 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

Adding to 31231311012 its reverse (21011313213), we get a palindrome (52242624225).

It can be divided in two parts, 31231 and 311012, that added together give a palindrome (342243).

The spelling of 31231311012 in words is "thirty-one billion, two hundred thirty-one million, three hundred eleven thousand, twelve".