809959079 has 2 divisors, whose sum is σ = 809959080. Its totient is φ = 809959078.

The previous prime is 809959063. The next prime is 809959081. The reversal of 809959079 is 970959908.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 809959079 - 2⁴ = 809959063 is a prime.

Together with 809959081, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (809959039) 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, 404979539 + 404979540.

It is an arithmetic number, because the mean of its divisors is an integer number (404979540).

Almost surely, 2^809959079 is an apocalyptic number.

809959079 is a deficient number, since it is larger than the sum of its proper divisors (1).

809959079 is an equidigital number, since it uses as much as digits as its factorization.

809959079 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1837080, while the sum is 56.

The square root of 809959079 is about 28459.7800237458. The cubic root of 809959079 is about 932.1540538599.

The spelling of 809959079 in words is "eight hundred nine million, nine hundred fifty-nine thousand, seventy-nine".