809693009 has 2 divisors, whose sum is σ = 809693010. Its totient is φ = 809693008.

The previous prime is 809692979. The next prime is 809693033. The reversal of 809693009 is 900396908.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 754710784 + 54982225 = 27472^2 + 7415^2 .

It is a cyclic number.

It is not a de Polignac number, because 809693009 - 2⁸ = 809692753 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (809693039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 404846504 + 404846505.

It is an arithmetic number, because the mean of its divisors is an integer number (404846505).

Almost surely, 2^809693009 is an apocalyptic number.

It is an amenable number.

809693009 is a deficient number, since it is larger than the sum of its proper divisors (1).

809693009 is an equidigital number, since it uses as much as digits as its factorization.

809693009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 104976, while the sum is 44.

The square root of 809693009 is about 28455.1051482858. The cubic root of 809693009 is about 932.0519724098.

The spelling of 809693009 in words is "eight hundred nine million, six hundred ninety-three thousand, nine".