85791 has 4 divisors (see below), whose sum is σ = 114392. Its totient is φ = 57192.

The previous prime is 85781. The next prime is 85793. The reversal of 85791 is 19758.

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

It is a de Polignac number, because none of the positive numbers 2^k-85791 is a prime.

It is a D-number.

It is a Duffinian number.

It is a plaindrome in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85793) 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 3 ways as a sum of consecutive naturals, for example, 14296 + ... + 14301.

It is an arithmetic number, because the mean of its divisors is an integer number (28598).

2⁸⁵⁷⁹¹ is an apocalyptic number.

85791 is a deficient number, since it is larger than the sum of its proper divisors (28601).

85791 is a wasteful number, since it uses less digits than its factorization.

85791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28600.

The product of its digits is 2520, while the sum is 30.

The square root of 85791 is about 292.9010071680. The cubic root of 85791 is about 44.1042637575.

The spelling of 85791 in words is "eighty-five thousand, seven hundred ninety-one".