550309 has 2 divisors, whose sum is σ = 550310. Its totient is φ = 550308.

The previous prime is 550289. The next prime is 550337. The reversal of 550309 is 903055.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 334084 + 216225 = 578^2 + 465^2 .

It is a cyclic number.

It is not a de Polignac number, because 550309 - 2⁷ = 550181 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 550309.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (550369) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 275154 + 275155.

It is an arithmetic number, because the mean of its divisors is an integer number (275155).

2⁵⁵⁰³⁰⁹ is an apocalyptic number.

It is an amenable number.

550309 is a deficient number, since it is larger than the sum of its proper divisors (1).

550309 is an equidigital number, since it uses as much as digits as its factorization.

550309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 675, while the sum is 22.

The square root of 550309 is about 741.8281472147. The cubic root of 550309 is about 81.9474678404.

The spelling of 550309 in words is "five hundred fifty thousand, three hundred nine".