85871 has 4 divisors (see below), whose sum is σ = 87912. Its totient is φ = 83832.

The previous prime is 85853. The next prime is 85889. The reversal of 85871 is 17858.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 17858 = 2 ⋅8929.

It is an interprime number because it is at equal distance from previous prime (85853) and next prime (85889).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-85871 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 (85831) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 956 + ... + 1041.

It is an arithmetic number, because the mean of its divisors is an integer number (21978).

2⁸⁵⁸⁷¹ is an apocalyptic number.

85871 is a deficient number, since it is larger than the sum of its proper divisors (2041).

85871 is a wasteful number, since it uses less digits than its factorization.

85871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2040.

The product of its digits is 2240, while the sum is 29.

The square root of 85871 is about 293.0375402572. The cubic root of 85871 is about 44.1179685554.

It can be divided in two parts, 858 and 71, that added together give a palindrome (929).

The spelling of 85871 in words is "eighty-five thousand, eight hundred seventy-one".