813159684 has 18 divisors (see below), whose sum is σ = 2055487070. Its totient is φ = 271053216.

The previous prime is 813159673. The next prime is 813159709. The reversal of 813159684 is 486951318.

It can be written as a sum of positive squares in only one way, i.e., 803722500 + 9437184 = 28350^2 + 3072^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a super-2 number, since 2×813159684² = 1322457343365959712, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11293849 + ... + 11293920.

Almost surely, 2^813159684 is an apocalyptic number.

It is an amenable number.

813159684 is an abundant number, since it is smaller than the sum of its proper divisors (1242327386).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

813159684 is a wasteful number, since it uses less digits than its factorization.

813159684 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22587779 (or 22587774 counting only the distinct ones).

The product of its digits is 207360, while the sum is 45.

The square root of 813159684 is about 28515.9549024752. The cubic root of 813159684 is about 933.3802622095.

The spelling of 813159684 in words is "eight hundred thirteen million, one hundred fifty-nine thousand, six hundred eighty-four".