55991589 has 8 divisors (see below), whose sum is σ = 74727552. Its totient is φ = 37291680.

The previous prime is 55991587. The next prime is 55991599. The reversal of 55991589 is 98519955.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 55991589 - 2¹ = 55991587 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55991587) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5152 + ... + 11769.

It is an arithmetic number, because the mean of its divisors is an integer number (9340944).

Almost surely, 2^55991589 is an apocalyptic number.

It is an amenable number.

55991589 is a deficient number, since it is larger than the sum of its proper divisors (18735963).

55991589 is a wasteful number, since it uses less digits than its factorization.

55991589 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18027.

The product of its digits is 729000, while the sum is 51.

The square root of 55991589 is about 7482.7527688679. The cubic root of 55991589 is about 382.5670812333.

The spelling of 55991589 in words is "fifty-five million, nine hundred ninety-one thousand, five hundred eighty-nine".