864531009 has 8 divisors (see below), whose sum is σ = 1280786720. Its totient is φ = 576353988.

The previous prime is 864530987. The next prime is 864531047. The reversal of 864531009 is 900135468.

864531009 is a `hidden beast` number, since 8 + 645 + 3 + 1 + 0 + 0 + 9 = 666.

It is not a de Polignac number, because 864531009 - 2⁹ = 864530497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (864531079) 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, 16009807 + ... + 16009860.

It is an arithmetic number, because the mean of its divisors is an integer number (160098340).

Almost surely, 2^864531009 is an apocalyptic number.

It is an amenable number.

864531009 is a deficient number, since it is larger than the sum of its proper divisors (416255711).

864531009 is a wasteful number, since it uses less digits than its factorization.

864531009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32019676 (or 32019670 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

The square root of 864531009 is about 29402.9081724921. The cubic root of 864531009 is about 952.6357125742.

The spelling of 864531009 in words is "eight hundred sixty-four million, five hundred thirty-one thousand, nine".