85009171 has 4 divisors (see below), whose sum is σ = 91548352. Its totient is φ = 78469992.

The previous prime is 85009159. The next prime is 85009187. The reversal of 85009171 is 17190058.

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 85009171 - 2⁵ = 85009139 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (85001171) 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, 3269571 + ... + 3269596.

It is an arithmetic number, because the mean of its divisors is an integer number (22887088).

Almost surely, 2^85009171 is an apocalyptic number.

85009171 is a deficient number, since it is larger than the sum of its proper divisors (6539181).

85009171 is a wasteful number, since it uses less digits than its factorization.

85009171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6539180.

The product of its (nonzero) digits is 2520, while the sum is 31.

The square root of 85009171 is about 9220.0418111850. The cubic root of 85009171 is about 439.6987797157.

It can be divided in two parts, 8500 and 9171, that added together give a palindrome (17671).

The spelling of 85009171 in words is "eighty-five million, nine thousand, one hundred seventy-one".