809689609 has 8 divisors (see below), whose sum is σ = 822814848. Its totient is φ = 796612320.

The previous prime is 809689577. The next prime is 809689637. The reversal of 809689609 is 906986908.

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

It is a cyclic number.

It is not a de Polignac number, because 809689609 - 2⁵ = 809689577 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 809689609.

It is not an unprimeable number, because it can be changed into a prime (809689669) 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, 22869 + ... + 46285.

It is an arithmetic number, because the mean of its divisors is an integer number (102851856).

Almost surely, 2^809689609 is an apocalyptic number.

It is an amenable number.

809689609 is a deficient number, since it is larger than the sum of its proper divisors (13125239).

809689609 is a wasteful number, since it uses less digits than its factorization.

809689609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23975.

The product of its (nonzero) digits is 1679616, while the sum is 55.

The square root of 809689609 is about 28455.0454049893. The cubic root of 809689609 is about 932.0506678079.

The spelling of 809689609 in words is "eight hundred nine million, six hundred eighty-nine thousand, six hundred nine".