864825231 has 16 divisors (see below), whose sum is σ = 1203922944. Its totient is φ = 551167584.

The previous prime is 864825229. The next prime is 864825251. The reversal of 864825231 is 132528468.

It is not a de Polignac number, because 864825231 - 2¹ = 864825229 is a prime.

It is a super-2 number, since 2×864825231² = 1495845360348406722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 864825231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (864825251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 207490 + ... + 211616.

It is an arithmetic number, because the mean of its divisors is an integer number (75245184).

Almost surely, 2^864825231 is an apocalyptic number.

864825231 is a deficient number, since it is larger than the sum of its proper divisors (339097713).

864825231 is a wasteful number, since it uses less digits than its factorization.

864825231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7190.

The product of its digits is 92160, while the sum is 39.

The square root of 864825231 is about 29407.9110274769. The cubic root of 864825231 is about 952.7437690778.

The spelling of 864825231 in words is "eight hundred sixty-four million, eight hundred twenty-five thousand, two hundred thirty-one".