31018919844 has 24 divisors (see below), whose sum is σ = 78957250848. Its totient is φ = 9399672640.

The previous prime is 31018919819. The next prime is 31018919857. The reversal of 31018919844 is 44891981013.

It is a junction number, because it is equal to n+sod(n) for n = 31018919793 and 31018919802.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 117495777 + ... + 117496040.

It is an arithmetic number, because the mean of its divisors is an integer number (3289885452).

Almost surely, 2^31018919844 is an apocalyptic number.

It is an amenable number.

31018919844 is an abundant number, since it is smaller than the sum of its proper divisors (47938331004).

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

31018919844 is a wasteful number, since it uses less digits than its factorization.

31018919844 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 234991835 (or 234991833 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 48.

It can be divided in two parts, 310189 and 19844, that added together give a palindrome (330033).

The spelling of 31018919844 in words is "thirty-one billion, eighteen million, nine hundred nineteen thousand, eight hundred forty-four".