556689 has 16 divisors (see below), whose sum is σ = 867200. Its totient is φ = 317520.

The previous prime is 556687. The next prime is 556691. The reversal of 556689 is 986655.

556689 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (556687) and next prime (556691).

It is not a de Polignac number, because 556689 - 2¹ = 556687 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a plaindrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (556687) 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, 759 + ... + 1299.

It is an arithmetic number, because the mean of its divisors is an integer number (54200).

2⁵⁵⁶⁶⁸⁹ is an apocalyptic number.

It is an amenable number.

556689 is a deficient number, since it is larger than the sum of its proper divisors (310511).

556689 is an equidigital number, since it uses as much as digits as its factorization.

556689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 565 (or 551 counting only the distinct ones).

The product of its digits is 64800, while the sum is 39.

The square root of 556689 is about 746.1159427328. The cubic root of 556689 is about 82.2629374549.

The spelling of 556689 in words is "five hundred fifty-six thousand, six hundred eighty-nine".