31911572044 has 72 divisors (see below), whose sum is σ = 63734101200. Its totient is φ = 13847621760.

The previous prime is 31911572041. The next prime is 31911572051. The reversal of 31911572044 is 44027511913.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 31911571994 and 31911572012.

It is not an unprimeable number, because it can be changed into a prime (31911572041) 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 23 ways as a sum of consecutive naturals, for example, 66620997 + ... + 66621475.

It is an arithmetic number, because the mean of its divisors is an integer number (885195850).

Almost surely, 2^31911572044 is an apocalyptic number.

It is an amenable number.

31911572044 is a deficient number, since it is larger than the sum of its proper divisors (31822529156).

31911572044 is a wasteful number, since it uses less digits than its factorization.

31911572044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1111 (or 630 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 37.

The spelling of 31911572044 in words is "thirty-one billion, nine hundred eleven million, five hundred seventy-two thousand, forty-four".