318689813 has 8 divisors (see below), whose sum is σ = 351186528. Its totient is φ = 287333424.

The previous prime is 318689807. The next prime is 318689821. The reversal of 318689813 is 318986813.

It is a happy number.

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 318689813 - 2⁸ = 318689557 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (318689113) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 284495 + ... + 285612.

It is an arithmetic number, because the mean of its divisors is an integer number (43898316).

Almost surely, 2^318689813 is an apocalyptic number.

It is an amenable number.

318689813 is a deficient number, since it is larger than the sum of its proper divisors (32496715).

318689813 is a wasteful number, since it uses less digits than its factorization.

318689813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 570163.

The product of its digits is 248832, while the sum is 47.

The square root of 318689813 is about 17851.8854186330. The cubic root of 318689813 is about 683.0556066446.

The spelling of 318689813 in words is "three hundred eighteen million, six hundred eighty-nine thousand, eight hundred thirteen".