809064209 has 4 divisors (see below), whose sum is σ = 809130480. Its totient is φ = 808997940.

The previous prime is 809064203. The next prime is 809064211. The reversal of 809064209 is 902460908.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-809064209 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (809064203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8927 + ... + 41204.

It is an arithmetic number, because the mean of its divisors is an integer number (202282620).

Almost surely, 2^809064209 is an apocalyptic number.

It is an amenable number.

809064209 is a deficient number, since it is larger than the sum of its proper divisors (66271).

809064209 is a wasteful number, since it uses less digits than its factorization.

809064209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66270.

The product of its (nonzero) digits is 31104, while the sum is 38.

The square root of 809064209 is about 28444.0540183709. The cubic root of 809064209 is about 931.8106356511.

The spelling of 809064209 in words is "eight hundred nine million, sixty-four thousand, two hundred nine".