85206591 has 6 divisors (see below), whose sum is σ = 123076200. Its totient is φ = 56804388.

The previous prime is 85206577. The next prime is 85206593. The reversal of 85206591 is 19560258.

It is a happy number.

It is not a de Polignac number, because 85206591 - 2⁷ = 85206463 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85206593) 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 in 5 ways as a sum of consecutive naturals, for example, 4733691 + ... + 4733708.

It is an arithmetic number, because the mean of its divisors is an integer number (20512700).

Almost surely, 2^85206591 is an apocalyptic number.

85206591 is a deficient number, since it is larger than the sum of its proper divisors (37869609).

85206591 is a wasteful number, since it uses less digits than its factorization.

85206591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9467405 (or 9467402 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 36.

The square root of 85206591 is about 9230.7416278433. The cubic root of 85206591 is about 440.0388929119.

The spelling of 85206591 in words is "eighty-five million, two hundred six thousand, five hundred ninety-one".