31312032120 has 96 divisors (see below), whose sum is σ = 102771789120. Its totient is φ = 8267193600.

The previous prime is 31312032107. The next prime is 31312032137. The reversal of 31312032120 is 2123021313.

31312032120 is a `hidden beast` number, since 31 + 312 + 0 + 321 + 2 + 0 = 666.

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

It is a junction number, because it is equal to n+sod(n) for n = 31312032093 and 31312032102.

It is a congruent number.

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, 394224 + ... + 466943.

It is an arithmetic number, because the mean of its divisors is an integer number (1070539470).

Almost surely, 2^31312032120 is an apocalyptic number.

31312032120 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31312032120 is an abundant number, since it is smaller than the sum of its proper divisors (71459757000).

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

31312032120 is a wasteful number, since it uses less digits than its factorization.

31312032120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 861285 (or 861278 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

Adding to 31312032120 its reverse (2123021313), we get a palindrome (33435053433).

The spelling of 31312032120 in words is "thirty-one billion, three hundred twelve million, thirty-two thousand, one hundred twenty".