550909 has 2 divisors, whose sum is σ = 550910. Its totient is φ = 550908.

The previous prime is 550903. The next prime is 550937. The reversal of 550909 is 909055.

It is an a-pointer prime, because the next prime (550937) can be obtained adding 550909 to its sum of digits (28).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 386884 + 164025 = 622^2 + 405^2 .

It is a cyclic number.

It is not a de Polignac number, because 550909 - 2¹¹ = 548861 is a prime.

It is a Chen prime.

550909 is a modest number, since divided by 909 gives 55 as remainder.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (550903) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 275454 + 275455.

It is an arithmetic number, because the mean of its divisors is an integer number (275455).

2⁵⁵⁰⁹⁰⁹ is an apocalyptic number.

It is an amenable number.

550909 is a deficient number, since it is larger than the sum of its proper divisors (1).

550909 is an equidigital number, since it uses as much as digits as its factorization.

550909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2025, while the sum is 28.

The square root of 550909 is about 742.2324433761. The cubic root of 550909 is about 81.9772393700.

The spelling of 550909 in words is "five hundred fifty thousand, nine hundred nine".