85610591 has 4 divisors (see below), whose sum is σ = 93393384. Its totient is φ = 77827800.

The previous prime is 85610543. The next prime is 85610597. The reversal of 85610591 is 19501658.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 85610591 - 2⁶ = 85610527 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85610597) 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 3 ways as a sum of consecutive naturals, for example, 3891380 + ... + 3891401.

It is an arithmetic number, because the mean of its divisors is an integer number (23348346).

Almost surely, 2^85610591 is an apocalyptic number.

85610591 is a deficient number, since it is larger than the sum of its proper divisors (7782793).

85610591 is a wasteful number, since it uses less digits than its factorization.

85610591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7782792.

The product of its (nonzero) digits is 10800, while the sum is 35.

The square root of 85610591 is about 9252.5991483475. The cubic root of 85610591 is about 440.7332659599.

The spelling of 85610591 in words is "eighty-five million, six hundred ten thousand, five hundred ninety-one".