5558991 has 16 divisors (see below), whose sum is σ = 7746528. Its totient is φ = 3542400.

The previous prime is 5558977. The next prime is 5558999. The reversal of 5558991 is 1998555.

It is a happy number.

It is not a de Polignac number, because 5558991 - 2⁷ = 5558863 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5558999) 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 15 ways as a sum of consecutive naturals, for example, 6361 + ... + 7181.

It is an arithmetic number, because the mean of its divisors is an integer number (484158).

Almost surely, 2^5558991 is an apocalyptic number.

5558991 is a deficient number, since it is larger than the sum of its proper divisors (2187537).

5558991 is a wasteful number, since it uses less digits than its factorization.

5558991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 922.

The product of its digits is 81000, while the sum is 42.

The square root of 5558991 is about 2357.7512591450. The cubic root of 5558991 is about 177.1462610527.

The spelling of 5558991 in words is "five million, five hundred fifty-eight thousand, nine hundred ninety-one".