549820309 has 16 divisors (see below), whose sum is σ = 618048000. Its totient is φ = 486682560.

The previous prime is 549820253. The next prime is 549820361. The reversal of 549820309 is 903028945.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 549820309 - 2⁷ = 549820181 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (549820399) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 987 + ... + 33175.

It is an arithmetic number, because the mean of its divisors is an integer number (38628000).

Almost surely, 2^549820309 is an apocalyptic number.

It is an amenable number.

549820309 is a deficient number, since it is larger than the sum of its proper divisors (68227691).

549820309 is a wasteful number, since it uses less digits than its factorization.

549820309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32268.

The product of its (nonzero) digits is 77760, while the sum is 40.

The square root of 549820309 is about 23448.2474611643. The cubic root of 549820309 is about 819.2320338160.

The spelling of 549820309 in words is "five hundred forty-nine million, eight hundred twenty thousand, three hundred nine".