550999409 has 2 divisors, whose sum is σ = 550999410. Its totient is φ = 550999408.

The previous prime is 550999403. The next prime is 550999417. The reversal of 550999409 is 904999055.

550999409 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 370177600 + 180821809 = 19240^2 + 13447^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-550999409 is a prime.

It is equal to p_28895189 and since 550999409 and 28895189 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (550999403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 275499704 + 275499705.

It is an arithmetic number, because the mean of its divisors is an integer number (275499705).

Almost surely, 2^550999409 is an apocalyptic number.

It is an amenable number.

550999409 is a deficient number, since it is larger than the sum of its proper divisors (1).

550999409 is an equidigital number, since it uses as much as digits as its factorization.

550999409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 656100, while the sum is 50.

The square root of 550999409 is about 23473.3765998844. The cubic root of 550999409 is about 819.8172351947.

The spelling of 550999409 in words is "five hundred fifty million, nine hundred ninety-nine thousand, four hundred nine".