549791209 has 6 divisors (see below), whose sum is σ = 604316090. Its totient is φ = 499810080.

The previous prime is 549791191. The next prime is 549791219. The reversal of 549791209 is 902197945.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 547419609 + 2371600 = 23397^2 + 1540^2 .

It is not a de Polignac number, because 549791209 - 2¹⁵ = 549758441 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (549791219) 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 in 5 ways as a sum of consecutive naturals, for example, 2271744 + ... + 2271985.

Almost surely, 2^549791209 is an apocalyptic number.

It is an amenable number.

549791209 is a deficient number, since it is larger than the sum of its proper divisors (54524881).

549791209 is a wasteful number, since it uses less digits than its factorization.

549791209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4543751 (or 4543740 counting only the distinct ones).

The product of its (nonzero) digits is 204120, while the sum is 46.

The square root of 549791209 is about 23447.6269374963. The cubic root of 549791209 is about 819.2175805650.

The spelling of 549791209 in words is "five hundred forty-nine million, seven hundred ninety-one thousand, two hundred nine".