864636911 has 4 divisors (see below), whose sum is σ = 864771024. Its totient is φ = 864502800.

The previous prime is 864636889. The next prime is 864636919. The reversal of 864636911 is 119636468.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-864636911 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (864636919) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 56870 + ... + 70451.

It is an arithmetic number, because the mean of its divisors is an integer number (216192756).

Almost surely, 2^864636911 is an apocalyptic number.

864636911 is a deficient number, since it is larger than the sum of its proper divisors (134113).

864636911 is a wasteful number, since it uses less digits than its factorization.

864636911 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134112.

The product of its digits is 186624, while the sum is 44.

The square root of 864636911 is about 29404.7089936289. The cubic root of 864636911 is about 952.6746091578.

The spelling of 864636911 in words is "eight hundred sixty-four million, six hundred thirty-six thousand, nine hundred eleven".