609669809 has 32 divisors (see below), whose sum is σ = 749760000. Its totient is φ = 494569152.

The previous prime is 609669803. The next prime is 609669821. The reversal of 609669809 is 908966906.

It is a de Polignac number, because none of the positive numbers 2^k-609669809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (609669803) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 859547 + ... + 860255.

It is an arithmetic number, because the mean of its divisors is an integer number (23430000).

Almost surely, 2^609669809 is an apocalyptic number.

It is an amenable number.

609669809 is a deficient number, since it is larger than the sum of its proper divisors (140090191).

609669809 is a wasteful number, since it uses less digits than its factorization.

609669809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 862 (or 848 counting only the distinct ones).

The product of its (nonzero) digits is 1259712, while the sum is 53.

The square root of 609669809 is about 24691.4926442287. The cubic root of 609669809 is about 847.9395579807.

The spelling of 609669809 in words is "six hundred nine million, six hundred sixty-nine thousand, eight hundred nine".