85085639 has 2 divisors, whose sum is σ = 85085640. Its totient is φ = 85085638.

The previous prime is 85085633. The next prime is 85085641. The reversal of 85085639 is 93658058.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 85085639 - 2¹² = 85081543 is a prime.

Together with 85085641, 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 85085639.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85085633) 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, 42542819 + 42542820.

It is an arithmetic number, because the mean of its divisors is an integer number (42542820).

Almost surely, 2^85085639 is an apocalyptic number.

85085639 is a deficient number, since it is larger than the sum of its proper divisors (1).

85085639 is an equidigital number, since it uses as much as digits as its factorization.

85085639 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 259200, while the sum is 44.

The square root of 85085639 is about 9224.1877149156. The cubic root of 85085639 is about 439.8305804355.

The spelling of 85085639 in words is "eighty-five million, eighty-five thousand, six hundred thirty-nine".