549609 has 4 divisors (see below), whose sum is σ = 732816. Its totient is φ = 366404.

The previous prime is 549607. The next prime is 549623. The reversal of 549609 is 906945.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 549609 - 2¹ = 549607 is a prime.

It is a D-number.

It is a self number, because there is not a number n which added to its sum of digits gives 549609.

It is not an unprimeable number, because it can be changed into a prime (549607) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 91599 + ... + 91604.

It is an arithmetic number, because the mean of its divisors is an integer number (183204).

2⁵⁴⁹⁶⁰⁹ is an apocalyptic number.

It is an amenable number.

549609 is a deficient number, since it is larger than the sum of its proper divisors (183207).

549609 is a wasteful number, since it uses less digits than its factorization.

549609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 183206.

The product of its (nonzero) digits is 9720, while the sum is 33.

The square root of 549609 is about 741.3561896956. The cubic root of 549609 is about 81.9127070261.

The spelling of 549609 in words is "five hundred forty-nine thousand, six hundred nine".