809714809 has 2 divisors, whose sum is σ = 809714810. Its totient is φ = 809714808.

The previous prime is 809714797. The next prime is 809714833. The reversal of 809714809 is 908417908.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 417793600 + 391921209 = 20440^2 + 19797^2 .

It is a cyclic number.

It is not a de Polignac number, because 809714809 - 2⁷ = 809714681 is a prime.

It is not a weakly prime, because it can be changed into another prime (809714869) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 404857404 + 404857405.

It is an arithmetic number, because the mean of its divisors is an integer number (404857405).

Almost surely, 2^809714809 is an apocalyptic number.

It is an amenable number.

809714809 is a deficient number, since it is larger than the sum of its proper divisors (1).

809714809 is an equidigital number, since it uses as much as digits as its factorization.

809714809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 145152, while the sum is 46.

The square root of 809714809 is about 28455.4882052654. The cubic root of 809714809 is about 932.0603371235.

The spelling of 809714809 in words is "eight hundred nine million, seven hundred fourteen thousand, eight hundred nine".