809335649 has 2 divisors, whose sum is σ = 809335650. Its totient is φ = 809335648.

The previous prime is 809335619. The next prime is 809335663. The reversal of 809335649 is 946533908.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 765352225 + 43983424 = 27665^2 + 6632^2 .

It is a cyclic number.

It is not a de Polignac number, because 809335649 - 2²⁴ = 792558433 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (809335619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 404667824 + 404667825.

It is an arithmetic number, because the mean of its divisors is an integer number (404667825).

Almost surely, 2^809335649 is an apocalyptic number.

It is an amenable number.

809335649 is a deficient number, since it is larger than the sum of its proper divisors (1).

809335649 is an equidigital number, since it uses as much as digits as its factorization.

809335649 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 699840, while the sum is 47.

The square root of 809335649 is about 28448.8250899752. The cubic root of 809335649 is about 931.9148310888.

The spelling of 809335649 in words is "eight hundred nine million, three hundred thirty-five thousand, six hundred forty-nine".