31211911872 has 112 divisors (see below), whose sum is σ = 97154817120. Its totient is φ = 9791963136.

The previous prime is 31211911837. The next prime is 31211911879. The reversal of 31211911872 is 27811911213.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (31211911879) 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 15 ways as a sum of consecutive naturals, for example, 501873 + ... + 560624.

Almost surely, 2^31211911872 is an apocalyptic number.

31211911872 is a gapful number since it is divisible by the number (32) formed by its first and last digit.

It is an amenable number.

31211911872 is an abundant number, since it is smaller than the sum of its proper divisors (65942905248).

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

31211911872 is a wasteful number, since it uses less digits than its factorization.

31211911872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1062535 (or 1062519 counting only the distinct ones).

The product of its digits is 6048, while the sum is 36.

The spelling of 31211911872 in words is "thirty-one billion, two hundred eleven million, nine hundred eleven thousand, eight hundred seventy-two".