79985539 has 2 divisors, whose sum is σ = 79985540. Its totient is φ = 79985538.

The previous prime is 79985537. The next prime is 79985597. The reversal of 79985539 is 93558997.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 79985539 - 2¹ = 79985537 is a prime.

Together with 79985537, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 79985539.

It is not a weakly prime, because it can be changed into another prime (79985531) 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, 39992769 + 39992770.

It is an arithmetic number, because the mean of its divisors is an integer number (39992770).

Almost surely, 2^79985539 is an apocalyptic number.

79985539 is a deficient number, since it is larger than the sum of its proper divisors (1).

79985539 is an equidigital number, since it uses as much as digits as its factorization.

79985539 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3061800, while the sum is 55.

The square root of 79985539 is about 8943.4634789884. The cubic root of 79985539 is about 430.8609737085.

The spelling of 79985539 in words is "seventy-nine million, nine hundred eighty-five thousand, five hundred thirty-nine".