809790193 has 2 divisors, whose sum is σ = 809790194. Its totient is φ = 809790192.

The previous prime is 809790167. The next prime is 809790209. The reversal of 809790193 is 391097908.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 606784689 + 203005504 = 24633^2 + 14248^2 .

It is a cyclic number.

It is not a de Polignac number, because 809790193 - 2⁵ = 809790161 is a prime.

It is not a weakly prime, because it can be changed into another prime (809790133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 404895096 + 404895097.

It is an arithmetic number, because the mean of its divisors is an integer number (404895097).

Almost surely, 2^809790193 is an apocalyptic number.

It is an amenable number.

809790193 is a deficient number, since it is larger than the sum of its proper divisors (1).

809790193 is an equidigital number, since it uses as much as digits as its factorization.

809790193 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 122472, while the sum is 46.

The square root of 809790193 is about 28456.8127695285. The cubic root of 809790193 is about 932.0892609929.

The spelling of 809790193 in words is "eight hundred nine million, seven hundred ninety thousand, one hundred ninety-three".