85656321 has 12 divisors (see below), whose sum is σ = 126060948. Its totient is φ = 56026464.

The previous prime is 85656287. The next prime is 85656331. The reversal of 85656321 is 12365658.

It can be written as a sum of positive squares in 2 ways, for example, as 61449921 + 24206400 = 7839^2 + 4920^2 .

It is not a de Polignac number, because 85656321 - 2¹⁴ = 85639937 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (85656331) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 89310 + ... + 90263.

It is an arithmetic number, because the mean of its divisors is an integer number (10505079).

Almost surely, 2^85656321 is an apocalyptic number.

It is an amenable number.

85656321 is a deficient number, since it is larger than the sum of its proper divisors (40404627).

85656321 is a wasteful number, since it uses less digits than its factorization.

85656321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 179632 (or 179629 counting only the distinct ones).

The product of its digits is 43200, while the sum is 36.

The square root of 85656321 is about 9255.0700159426. The cubic root of 85656321 is about 440.8117264418.

The spelling of 85656321 in words is "eighty-five million, six hundred fifty-six thousand, three hundred twenty-one".