809098813 has 2 divisors, whose sum is σ = 809098814. Its totient is φ = 809098812.

The previous prime is 809098781. The next prime is 809098817. The reversal of 809098813 is 318890908.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 698386329 + 110712484 = 26427^2 + 10522^2 .

It is a cyclic number.

It is not a de Polignac number, because 809098813 - 2⁵ = 809098781 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (809098817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 404549406 + 404549407.

It is an arithmetic number, because the mean of its divisors is an integer number (404549407).

Almost surely, 2^809098813 is an apocalyptic number.

It is an amenable number.

809098813 is a deficient number, since it is larger than the sum of its proper divisors (1).

809098813 is an equidigital number, since it uses as much as digits as its factorization.

809098813 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 124416, while the sum is 46.

The square root of 809098813 is about 28444.6622936536. The cubic root of 809098813 is about 931.8239200996.

The spelling of 809098813 in words is "eight hundred nine million, ninety-eight thousand, eight hundred thirteen".