31331233120 has 48 divisors (see below), whose sum is σ = 80749137168. Its totient is φ = 11393175040.

The previous prime is 31331233099. The next prime is 31331233133. The reversal of 31331233120 is 2133213313.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a junction number, because it is equal to n+sod(n) for n = 31331233091 and 31331233100.

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 7 ways as a sum of consecutive naturals, for example, 8899159 + ... + 8902678.

It is an arithmetic number, because the mean of its divisors is an integer number (1682273691).

Almost surely, 2^31331233120 is an apocalyptic number.

It is an amenable number.

31331233120 is an abundant number, since it is smaller than the sum of its proper divisors (49417904048).

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

31331233120 is a wasteful number, since it uses less digits than its factorization.

31331233120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17801863 (or 17801855 counting only the distinct ones).

The product of its (nonzero) digits is 972, while the sum is 22.

Adding to 31331233120 its reverse (2133213313), we get a palindrome (33464446433).

The spelling of 31331233120 in words is "thirty-one billion, three hundred thirty-one million, two hundred thirty-three thousand, one hundred twenty".