85171 has 4 divisors (see below), whose sum is σ = 86832. Its totient is φ = 83512.

The previous prime is 85159. The next prime is 85193. The reversal of 85171 is 17158.

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 85171 - 2⁹ = 84659 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85121) 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, 751 + ... + 856.

It is an arithmetic number, because the mean of its divisors is an integer number (21708).

2⁸⁵¹⁷¹ is an apocalyptic number.

85171 is a deficient number, since it is larger than the sum of its proper divisors (1661).

85171 is a wasteful number, since it uses less digits than its factorization.

85171 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1660.

The product of its digits is 280, while the sum is 22.

The square root of 85171 is about 291.8407099772. The cubic root of 85171 is about 43.9977615941.

It can be divided in two parts, 85 and 171, that multiplied together give a triangular number (14535 = T₁₇₀).

The spelling of 85171 in words is "eighty-five thousand, one hundred seventy-one".