80509879 has 2 divisors, whose sum is σ = 80509880. Its totient is φ = 80509878.

The previous prime is 80509873. The next prime is 80509939. The reversal of 80509879 is 97890508.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 80509879 - 2²³ = 72121271 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (80509873) 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, 40254939 + 40254940.

It is an arithmetic number, because the mean of its divisors is an integer number (40254940).

Almost surely, 2^80509879 is an apocalyptic number.

80509879 is a deficient number, since it is larger than the sum of its proper divisors (1).

80509879 is an equidigital number, since it uses as much as digits as its factorization.

80509879 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 181440, while the sum is 46.

The square root of 80509879 is about 8972.7297407199. The cubic root of 80509879 is about 431.8004175672.

The spelling of 80509879 in words is "eighty million, five hundred nine thousand, eight hundred seventy-nine".