864559 has 6 divisors (see below), whose sum is σ = 897824. Its totient is φ = 831660.

The previous prime is 864551. The next prime is 864581. The reversal of 864559 is 955468.

It is not a de Polignac number, because 864559 - 2³ = 864551 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 (864551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5094 + ... + 5260.

2⁸⁶⁴⁵⁵⁹ is an apocalyptic number.

864559 is a deficient number, since it is larger than the sum of its proper divisors (33265).

864559 is an equidigital number, since it uses as much as digits as its factorization.

864559 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 365 (or 198 counting only the distinct ones).

The product of its digits is 43200, while the sum is 37.

The square root of 864559 is about 929.8166485926. The cubic root of 864559 is about 95.2645993655.

Subtracting 864559 from its reverse (955468), we obtain a palindrome (90909).

The spelling of 864559 in words is "eight hundred sixty-four thousand, five hundred fifty-nine".