209609609 has 8 divisors (see below), whose sum is σ = 242116128. Its totient is φ = 179344960.

The previous prime is 209609599. The next prime is 209609623. The reversal of 209609609 is 906906902.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-209609609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (209609629) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 560267 + ... + 560640.

It is an arithmetic number, because the mean of its divisors is an integer number (30264516).

Almost surely, 2^209609609 is an apocalyptic number.

It is an amenable number.

209609609 is a deficient number, since it is larger than the sum of its proper divisors (32506519).

209609609 is a wasteful number, since it uses less digits than its factorization.

209609609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1120935.

The product of its (nonzero) digits is 52488, while the sum is 41.

The square root of 209609609 is about 14477.9007110838. The cubic root of 209609609 is about 594.0236408266.

The spelling of 209609609 in words is "two hundred nine million, six hundred nine thousand, six hundred nine".