864553 has 4 divisors (see below), whose sum is σ = 878788. Its totient is φ = 850320.

The previous prime is 864551. The next prime is 864581. The reversal of 864553 is 355468.

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

It can be written as a sum of positive squares in 2 ways, for example, as 350464 + 514089 = 592^2 + 717^2 .

It is a cyclic number.

It is not a de Polignac number, because 864553 - 2¹ = 864551 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (864551) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7026 + ... + 7147.

It is an arithmetic number, because the mean of its divisors is an integer number (219697).

2⁸⁶⁴⁵⁵³ is an apocalyptic number.

It is an amenable number.

864553 is a deficient number, since it is larger than the sum of its proper divisors (14235).

864553 is a wasteful number, since it uses less digits than its factorization.

864553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14234.

The product of its digits is 14400, while the sum is 31.

The square root of 864553 is about 929.8134221445. The cubic root of 864553 is about 95.2643789876.

The spelling of 864553 in words is "eight hundred sixty-four thousand, five hundred fifty-three".