556551 has 10 divisors (see below), whose sum is σ = 831512. Its totient is φ = 370980.

The previous prime is 556537. The next prime is 556559. The reversal of 556551 is 155655.

556551 is a `hidden beast` number, since 5 + 5 + 655 + 1 = 666.

556551 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 556551 - 2⁵ = 556519 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 556551.

It is not an unprimeable number, because it can be changed into a prime (556559) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 3355 + ... + 3516.

2⁵⁵⁶⁵⁵¹ is an apocalyptic number.

556551 is a deficient number, since it is larger than the sum of its proper divisors (274961).

556551 is an equidigital number, since it uses as much as digits as its factorization.

556551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6883 (or 6874 counting only the distinct ones).

The product of its digits is 3750, while the sum is 27.

The square root of 556551 is about 746.0234580762. The cubic root of 556551 is about 82.2561393902.

The spelling of 556551 in words is "five hundred fifty-six thousand, five hundred fifty-one".