318764921 has 4 divisors (see below), whose sum is σ = 322800000. Its totient is φ = 314729844.

The previous prime is 318764911. The next prime is 318764923. The reversal of 318764921 is 129467813.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 318764921 - 2²² = 314570617 is a prime.

It is a super-2 number, since 2×318764921² = 203222149720272482, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (318764923) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2017421 + ... + 2017578.

It is an arithmetic number, because the mean of its divisors is an integer number (80700000).

Almost surely, 2^318764921 is an apocalyptic number.

It is an amenable number.

318764921 is a deficient number, since it is larger than the sum of its proper divisors (4035079).

318764921 is an equidigital number, since it uses as much as digits as its factorization.

318764921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4035078.

The product of its digits is 72576, while the sum is 41.

The square root of 318764921 is about 17853.9889380497. The cubic root of 318764921 is about 683.1092626958.

The spelling of 318764921 in words is "three hundred eighteen million, seven hundred sixty-four thousand, nine hundred twenty-one".