31444138518 has 32 divisors (see below), whose sum is σ = 68024226816. Its totient is φ = 9632492448.

The previous prime is 31444138499. The next prime is 31444138601. The reversal of 31444138518 is 81583144413.

It is a self number, because there is not a number n which added to its sum of digits gives 31444138518.

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 15 ways as a sum of consecutive naturals, for example, 870246 + ... + 905657.

It is an arithmetic number, because the mean of its divisors is an integer number (2125757088).

Almost surely, 2^31444138518 is an apocalyptic number.

31444138518 is an abundant number, since it is smaller than the sum of its proper divisors (36580088298).

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

31444138518 is a wasteful number, since it uses less digits than its factorization.

31444138518 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1776148.

The product of its digits is 184320, while the sum is 42.

The spelling of 31444138518 in words is "thirty-one billion, four hundred forty-four million, one hundred thirty-eight thousand, five hundred eighteen".