864193121 has 16 divisors (see below), whose sum is σ = 970704000. Its totient is φ = 762537600.

The previous prime is 864193117. The next prime is 864193133. The reversal of 864193121 is 121391468.

It is not a de Polignac number, because 864193121 - 2² = 864193117 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (864193111) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 84935 + ... + 94563.

It is an arithmetic number, because the mean of its divisors is an integer number (60669000).

Almost surely, 2^864193121 is an apocalyptic number.

It is an amenable number.

864193121 is a deficient number, since it is larger than the sum of its proper divisors (106510879).

864193121 is a wasteful number, since it uses less digits than its factorization.

864193121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9880.

The product of its digits is 10368, while the sum is 35.

The square root of 864193121 is about 29397.1617847710. The cubic root of 864193121 is about 952.5115889681.

The spelling of 864193121 in words is "eight hundred sixty-four million, one hundred ninety-three thousand, one hundred twenty-one".