31382513898 has 128 divisors (see below), whose sum is σ = 68990828544. Its totient is φ = 9486892800.

The previous prime is 31382513873. The next prime is 31382513909. The reversal of 31382513898 is 89831528313.

It is a happy number.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 31382513898.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 84135240 + ... + 84135612.

It is an arithmetic number, because the mean of its divisors is an integer number (538990848).

Almost surely, 2^31382513898 is an apocalyptic number.

31382513898 is an abundant number, since it is smaller than the sum of its proper divisors (37608314646).

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

31382513898 is a wasteful number, since it uses less digits than its factorization.

31382513898 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 780.

The product of its digits is 1244160, while the sum is 51.

It can be divided in two parts, 313825 and 13898, that added together give a palindrome (327723).

The spelling of 31382513898 in words is "thirty-one billion, three hundred eighty-two million, five hundred thirteen thousand, eight hundred ninety-eight".