550989 has 8 divisors (see below), whose sum is σ = 816320. Its totient is φ = 367308.

The previous prime is 550973. The next prime is 550993. The reversal of 550989 is 989055.

It is not a de Polignac number, because 550989 - 2⁴ = 550973 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (550909) 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, 10177 + ... + 10230.

It is an arithmetic number, because the mean of its divisors is an integer number (102040).

2⁵⁵⁰⁹⁸⁹ is an apocalyptic number.

It is an amenable number.

550989 is a deficient number, since it is larger than the sum of its proper divisors (265331).

550989 is a wasteful number, since it uses less digits than its factorization.

550989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20416 (or 20410 counting only the distinct ones).

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

The square root of 550989 is about 742.2863328932. The cubic root of 550989 is about 81.9812072738.

The spelling of 550989 in words is "five hundred fifty thousand, nine hundred eighty-nine".