549561009 has 8 divisors (see below), whose sum is σ = 742785952. Its totient is φ = 361355040.

The previous prime is 549560953. The next prime is 549561013. The reversal of 549561009 is 900165945.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 549561009 - 2⁹ = 549560497 is a prime.

It is a super-2 number, since 2×549561009² = 604034605226196162, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (549561029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1254487 + ... + 1254924.

It is an arithmetic number, because the mean of its divisors is an integer number (92848244).

Almost surely, 2^549561009 is an apocalyptic number.

It is an amenable number.

549561009 is a deficient number, since it is larger than the sum of its proper divisors (193224943).

549561009 is a wasteful number, since it uses less digits than its factorization.

549561009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2509487.

The product of its (nonzero) digits is 48600, while the sum is 39.

The square root of 549561009 is about 23442.7176112327. The cubic root of 549561009 is about 819.1032279342.

The spelling of 549561009 in words is "five hundred forty-nine million, five hundred sixty-one thousand, nine".