31123230112 has 24 divisors (see below), whose sum is σ = 65987233956. Its totient is φ = 14364567552.

The previous prime is 31123230071. The next prime is 31123230113. The reversal of 31123230112 is 21103232113.

It can be written as a sum of positive squares in 2 ways, for example, as 30319167376 + 804062736 = 174124^2 + 28356^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 31123230112.

It is not an unprimeable number, because it can be changed into a prime (31123230113) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 37407313 + ... + 37408144.

Almost surely, 2^31123230112 is an apocalyptic number.

31123230112 is a gapful number since it is divisible by the number (32) formed by its first and last digit.

It is an amenable number.

31123230112 is an abundant number, since it is smaller than the sum of its proper divisors (34864003844).

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

31123230112 is a wasteful number, since it uses less digits than its factorization.

31123230112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74815480 (or 74815472 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 31123230112 its reverse (21103232113), we get a palindrome (52226462225).

The spelling of 31123230112 in words is "thirty-one billion, one hundred twenty-three million, two hundred thirty thousand, one hundred twelve".