804406609 has 2 divisors, whose sum is σ = 804406610. Its totient is φ = 804406608.

The previous prime is 804406607. The next prime is 804406627. The reversal of 804406609 is 906604408.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 800720209 + 3686400 = 28297^2 + 1920^2 .

It is a cyclic number.

It is not a de Polignac number, because 804406609 - 2¹ = 804406607 is a prime.

Together with 804406607, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (804406607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 402203304 + 402203305.

It is an arithmetic number, because the mean of its divisors is an integer number (402203305).

Almost surely, 2^804406609 is an apocalyptic number.

It is an amenable number.

804406609 is a deficient number, since it is larger than the sum of its proper divisors (1).

804406609 is an equidigital number, since it uses as much as digits as its factorization.

804406609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 41472, while the sum is 37.

The square root of 804406609 is about 28362.0628481075. The cubic root of 804406609 is about 930.0191189656.

The spelling of 804406609 in words is "eight hundred four million, four hundred six thousand, six hundred nine".