85656139 has 8 divisors (see below), whose sum is σ = 87912032. Its totient is φ = 83427840.

The previous prime is 85656133. The next prime is 85656143. The reversal of 85656139 is 93165658.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 85656139 - 2¹⁵ = 85623371 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 85656095 and 85656104.

It is not an unprimeable number, because it can be changed into a prime (85656133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 534 + ... + 13099.

It is an arithmetic number, because the mean of its divisors is an integer number (10989004).

Almost surely, 2^85656139 is an apocalyptic number.

85656139 is a deficient number, since it is larger than the sum of its proper divisors (2255893).

85656139 is a wasteful number, since it uses less digits than its factorization.

85656139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13797.

The product of its digits is 194400, while the sum is 43.

The square root of 85656139 is about 9255.0601834888. The cubic root of 85656139 is about 440.8114142337.

The spelling of 85656139 in words is "eighty-five million, six hundred fifty-six thousand, one hundred thirty-nine".