318221685 has 24 divisors (see below), whose sum is σ = 556653240. Its totient is φ = 168158592.

The previous prime is 318221653. The next prime is 318221707. The reversal of 318221685 is 586122813.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 145009764 + 173211921 = 12042^2 + 13161^2 .

It is not a de Polignac number, because 318221685 - 2⁵ = 318221653 is a prime.

It is a Curzon number.

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 23 ways as a sum of consecutive naturals, for example, 27534 + ... + 37343.

It is an arithmetic number, because the mean of its divisors is an integer number (23193885).

Almost surely, 2^318221685 is an apocalyptic number.

It is an amenable number.

318221685 is a deficient number, since it is larger than the sum of its proper divisors (238431555).

318221685 is a wasteful number, since it uses less digits than its factorization.

318221685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64997 (or 64994 counting only the distinct ones).

The product of its digits is 23040, while the sum is 36.

The square root of 318221685 is about 17838.7691559704. The cubic root of 318221685 is about 682.7209927188.

The spelling of 318221685 in words is "three hundred eighteen million, two hundred twenty-one thousand, six hundred eighty-five".