809366689 has 2 divisors, whose sum is σ = 809366690. Its totient is φ = 809366688.

The previous prime is 809366647. The next prime is 809366783. The reversal of 809366689 is 986663908.

809366689 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 677300625 + 132066064 = 26025^2 + 11492^2 .

It is a cyclic number.

It is not a de Polignac number, because 809366689 - 2⁷ = 809366561 is a prime.

It is not a weakly prime, because it can be changed into another prime (809366629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 404683344 + 404683345.

It is an arithmetic number, because the mean of its divisors is an integer number (404683345).

Almost surely, 2^809366689 is an apocalyptic number.

It is an amenable number.

809366689 is a deficient number, since it is larger than the sum of its proper divisors (1).

809366689 is an equidigital number, since it uses as much as digits as its factorization.

809366689 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3359232, while the sum is 55.

The square root of 809366689 is about 28449.3706257274. The cubic root of 809366689 is about 931.9267446736.

The spelling of 809366689 in words is "eight hundred nine million, three hundred sixty-six thousand, six hundred eighty-nine".