5556591 has 12 divisors (see below), whose sum is σ = 8076432. Its totient is φ = 3681216.

The previous prime is 5556559. The next prime is 5556619. The reversal of 5556591 is 1956555.

5556591 is a `hidden beast` number, since 5 + 5 + 565 + 91 = 666.

It is not a de Polignac number, because 5556591 - 2⁵ = 5556559 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5556521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 346 + ... + 3351.

It is an arithmetic number, because the mean of its divisors is an integer number (673036).

Almost surely, 2^5556591 is an apocalyptic number.

5556591 is a deficient number, since it is larger than the sum of its proper divisors (2519841).

5556591 is a wasteful number, since it uses less digits than its factorization.

5556591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3870 (or 3867 counting only the distinct ones).

The product of its digits is 33750, while the sum is 36.

The square root of 5556591 is about 2357.2422446579. The cubic root of 5556591 is about 177.1207640860.

Subtracting from 5556591 its sum of digits (36), we obtain a palindrome (5556555).

The spelling of 5556591 in words is "five million, five hundred fifty-six thousand, five hundred ninety-one".