85639 has 2 divisors, whose sum is σ = 85640. Its totient is φ = 85638.

The previous prime is 85627. The next prime is 85643. The reversal of 85639 is 93658.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 85639 - 2⁵ = 85607 is a prime.

It is a Chen prime.

It is a d-powerful number, because it can be written as 8 + 5⁷ + 6³ + 3⁸ + 9³ .

It is a self number, because there is not a number n which added to its sum of digits gives 85639.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42819 + 42820.

It is an arithmetic number, because the mean of its divisors is an integer number (42820).

2⁸⁵⁶³⁹ is an apocalyptic number.

85639 is a deficient number, since it is larger than the sum of its proper divisors (1).

85639 is an equidigital number, since it uses as much as digits as its factorization.

85639 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6480, while the sum is 31.

The square root of 85639 is about 292.6414188047. The cubic root of 85639 is about 44.0782011512.

The spelling of 85639 in words is "eighty-five thousand, six hundred thirty-nine".