6605609 has 4 divisors (see below), whose sum is σ = 6622980. Its totient is φ = 6588240.

The previous prime is 6605593. The next prime is 6605653. The reversal of 6605609 is 9065066.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4494400 + 2111209 = 2120^2 + 1453^2 .

It is a cyclic number.

It is not a de Polignac number, because 6605609 - 2⁴ = 6605593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6605309) 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 3 ways as a sum of consecutive naturals, for example, 8102 + ... + 8879.

It is an arithmetic number, because the mean of its divisors is an integer number (1655745).

Almost surely, 2^6605609 is an apocalyptic number.

It is an amenable number.

6605609 is a deficient number, since it is larger than the sum of its proper divisors (17371).

6605609 is a wasteful number, since it uses less digits than its factorization.

6605609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17370.

The product of its (nonzero) digits is 9720, while the sum is 32.

The square root of 6605609 is about 2570.1379340417. The cubic root of 6605609 is about 187.6308680451.

The spelling of 6605609 in words is "six million, six hundred five thousand, six hundred nine".