55989 has 6 divisors (see below), whose sum is σ = 80886. Its totient is φ = 37320.

The previous prime is 55987. The next prime is 55997. The reversal of 55989 is 98955.

It can be written as a sum of positive squares in only one way, i.e., 33489 + 22500 = 183^2 + 150^2 .

It is not a de Polignac number, because 55989 - 2¹ = 55987 is a prime.

It is a plaindrome in base 6.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55987) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3102 + ... + 3119.

It is an arithmetic number, because the mean of its divisors is an integer number (13481).

2⁵⁵⁹⁸⁹ is an apocalyptic number.

It is an amenable number.

55989 is a deficient number, since it is larger than the sum of its proper divisors (24897).

55989 is a wasteful number, since it uses less digits than its factorization.

55989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6227 (or 6224 counting only the distinct ones).

The product of its digits is 16200, while the sum is 36.

The square root of 55989 is about 236.6199484405. The cubic root of 55989 is about 38.2561184625.

The spelling of 55989 in words is "fifty-five thousand, nine hundred eighty-nine".