550509 has 4 divisors (see below), whose sum is σ = 734016. Its totient is φ = 367004.

The previous prime is 550489. The next prime is 550513. The reversal of 550509 is 905055.

550509 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 550509 - 2¹¹ = 548461 is a prime.

It is a D-number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (550519) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 91749 + ... + 91754.

It is an arithmetic number, because the mean of its divisors is an integer number (183504).

2⁵⁵⁰⁵⁰⁹ is an apocalyptic number.

It is an amenable number.

550509 is a deficient number, since it is larger than the sum of its proper divisors (183507).

550509 is a wasteful number, since it uses less digits than its factorization.

550509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 183506.

The product of its (nonzero) digits is 1125, while the sum is 24.

The square root of 550509 is about 741.9629370797. The cubic root of 550509 is about 81.9573940870.

The spelling of 550509 in words is "five hundred fifty thousand, five hundred nine".