31381618859 has 8 divisors (see below), whose sum is σ = 31551706128. Its totient is φ = 31211811360.

The previous prime is 31381618841. The next prime is 31381618871. The reversal of 31381618859 is 95881618313.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 31381618859 - 2³² = 27086651563 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31381618859.

It is not an unprimeable number, because it can be changed into a prime (31381618459) 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 7 ways as a sum of consecutive naturals, for example, 156989 + ... + 295649.

It is an arithmetic number, because the mean of its divisors is an integer number (3943963266).

Almost surely, 2^31381618859 is an apocalyptic number.

31381618859 is a deficient number, since it is larger than the sum of its proper divisors (170087269).

31381618859 is a wasteful number, since it uses less digits than its factorization.

31381618859 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139885.

The product of its digits is 1244160, while the sum is 53.

The spelling of 31381618859 in words is "thirty-one billion, three hundred eighty-one million, six hundred eighteen thousand, eight hundred fifty-nine".