318990861 has 48 divisors (see below), whose sum is σ = 539136000. Its totient is φ = 177993504.

The previous prime is 318990857. The next prime is 318990883. The reversal of 318990861 is 168099813.

It is not a de Polignac number, because 318990861 - 2² = 318990857 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (318990811) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 532240 + ... + 532838.

It is an arithmetic number, because the mean of its divisors is an integer number (11232000).

Almost surely, 2^318990861 is an apocalyptic number.

It is an amenable number.

318990861 is a deficient number, since it is larger than the sum of its proper divisors (220145139).

318990861 is a wasteful number, since it uses less digits than its factorization.

318990861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 798 (or 795 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 45.

The square root of 318990861 is about 17860.3152547764. The cubic root of 318990861 is about 683.2706201155.

The spelling of 318990861 in words is "three hundred eighteen million, nine hundred ninety thousand, eight hundred sixty-one".