549960209 has 2 divisors, whose sum is σ = 549960210. Its totient is φ = 549960208.

The previous prime is 549960163. The next prime is 549960223. The reversal of 549960209 is 902069945.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 533379025 + 16581184 = 23095^2 + 4072^2 .

It is a cyclic number.

It is not a de Polignac number, because 549960209 - 2¹⁶ = 549894673 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 549960209.

It is not a weakly prime, because it can be changed into another prime (549960269) 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, 274980104 + 274980105.

It is an arithmetic number, because the mean of its divisors is an integer number (274980105).

Almost surely, 2^549960209 is an apocalyptic number.

It is an amenable number.

549960209 is a deficient number, since it is larger than the sum of its proper divisors (1).

549960209 is an equidigital number, since it uses as much as digits as its factorization.

549960209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 174960, while the sum is 44.

The square root of 549960209 is about 23451.2304368022. The cubic root of 549960209 is about 819.3015115710.

The spelling of 549960209 in words is "five hundred forty-nine million, nine hundred sixty thousand, two hundred nine".