550009 has 2 divisors, whose sum is σ = 550010. Its totient is φ = 550008.

The previous prime is 550007. The next prime is 550027. The reversal of 550009 is 900055.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 356409 + 193600 = 597^2 + 440^2 .

It is a cyclic number.

It is not a de Polignac number, because 550009 - 2¹ = 550007 is a prime.

Together with 550007, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (550007) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 275004 + 275005.

It is an arithmetic number, because the mean of its divisors is an integer number (275005).

2⁵⁵⁰⁰⁰⁹ is an apocalyptic number.

It is an amenable number.

550009 is a deficient number, since it is larger than the sum of its proper divisors (1).

550009 is an equidigital number, since it uses as much as digits as its factorization.

550009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 225, while the sum is 19.

The square root of 550009 is about 741.6259164835. The cubic root of 550009 is about 81.9325739601.

The spelling of 550009 in words is "five hundred fifty thousand, nine".