31231120313112 has 16 divisors (see below), whose sum is σ = 78077800782840. Its totient is φ = 10410373437696.

The previous prime is 31231120313111. The next prime is 31231120313131. The reversal of 31231120313112 is 21131302113213.

It is a Harshad number since it is a multiple of its sum of digits (24), and also a Moran number because the ratio is a prime number: 1301296679713 = 31231120313112 / (3 + 1 + 2 + 3 + 1 + 1 + 2 + 0 + 3 + 1 + 3 + 1 + 1 + 2).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31231120313111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 650648339833 + ... + 650648339880.

Almost surely, 2^{31231120313112} is an apocalyptic number.

It is an amenable number.

31231120313112 is an abundant number, since it is smaller than the sum of its proper divisors (46846680469728).

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

31231120313112 is a wasteful number, since it uses less digits than its factorization.

31231120313112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1301296679722 (or 1301296679718 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 24.

Adding to 31231120313112 its reverse (21131302113213), we get a palindrome (52362422426325).

The spelling of 31231120313112 in words is "thirty-one trillion, two hundred thirty-one billion, one hundred twenty million, three hundred thirteen thousand, one hundred twelve".