6609 has 4 divisors (see below), whose sum is σ = 8816. Its totient is φ = 4404.

The previous prime is 6607. The next prime is 6619. The reversal of 6609 is 9066.

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 not a de Polignac number, because 6609 - 2¹ = 6607 is a prime.

It is a D-number.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (6607) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1099 + ... + 1104.

It is an arithmetic number, because the mean of its divisors is an integer number (2204).

2⁶⁶⁰⁹ is an apocalyptic number.

It is an amenable number.

6609 is a deficient number, since it is larger than the sum of its proper divisors (2207).

6609 is a wasteful number, since it uses less digits than its factorization.

6609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2206.

The product of its (nonzero) digits is 324, while the sum is 21.

The square root of 6609 is about 81.2957563468. The cubic root of 6609 is about 18.7662969422.

The spelling of 6609 in words is "six thousand, six hundred nine".