809342089 has 2 divisors, whose sum is σ = 809342090. Its totient is φ = 809342088.

The previous prime is 809342077. The next prime is 809342129. The reversal of 809342089 is 980243908.

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., 771728400 + 37613689 = 27780^2 + 6133^2 .

It is a cyclic number.

It is not a de Polignac number, because 809342089 - 2¹³ = 809333897 is a prime.

It is not a weakly prime, because it can be changed into another prime (809312089) 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, 404671044 + 404671045.

It is an arithmetic number, because the mean of its divisors is an integer number (404671045).

Almost surely, 2^809342089 is an apocalyptic number.

It is an amenable number.

809342089 is a deficient number, since it is larger than the sum of its proper divisors (1).

809342089 is an equidigital number, since it uses as much as digits as its factorization.

809342089 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 43.

The square root of 809342089 is about 28448.9382754436. The cubic root of 809342089 is about 931.9173028757.

The spelling of 809342089 in words is "eight hundred nine million, three hundred forty-two thousand, eighty-nine".