549009 has 6 divisors (see below), whose sum is σ = 793026. Its totient is φ = 366000.

The previous prime is 549001. The next prime is 549011. The reversal of 549009 is 900945.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 497025 + 51984 = 705^2 + 228^2 .

It is not a de Polignac number, because 549009 - 2³ = 549001 is a prime.

It is not an unprimeable number, because it can be changed into a prime (549001) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 30492 + ... + 30509.

It is an arithmetic number, because the mean of its divisors is an integer number (132171).

2⁵⁴⁹⁰⁰⁹ is an apocalyptic number.

It is an amenable number.

549009 is a deficient number, since it is larger than the sum of its proper divisors (244017).

549009 is a wasteful number, since it uses less digits than its factorization.

549009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61007 (or 61004 counting only the distinct ones).

The product of its (nonzero) digits is 1620, while the sum is 27.

The square root of 549009 is about 740.9514154113. The cubic root of 549009 is about 81.8828885432.

The spelling of 549009 in words is "five hundred forty-nine thousand, nine".