31311010120 has 32 divisors (see below), whose sum is σ = 75868987320. Its totient is φ = 11560988160.

The previous prime is 31311010009. The next prime is 31311010123. The reversal of 31311010120 is 2101011313.

It can be written as a sum of positive squares in 4 ways, for example, as 18080029444 + 13230980676 = 134462^2 + 115026^2 .

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a self number, because there is not a number n which added to its sum of digits gives 31311010120.

It is not an unprimeable number, because it can be changed into a prime (31311010123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30106221 + ... + 30107260.

Almost surely, 2^31311010120 is an apocalyptic number.

It is an amenable number.

31311010120 is an abundant number, since it is smaller than the sum of its proper divisors (44557977200).

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

31311010120 is a wasteful number, since it uses less digits than its factorization.

31311010120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60213505 (or 60213501 counting only the distinct ones).

The product of its (nonzero) digits is 18, while the sum is 13.

Adding to 31311010120 its reverse (2101011313), we get a palindrome (33412021433).

The spelling of 31311010120 in words is "thirty-one billion, three hundred eleven million, ten thousand, one hundred twenty".