171172161 has 24 divisors (see below), whose sum is σ = 252942144. Its totient is φ = 111512160.

The previous prime is 171172129. The next prime is 171172229. The reversal of 171172161 is 161271171.

It is not a de Polignac number, because 171172161 - 2⁵ = 171172129 is a prime.

It is not an unprimeable number, because it can be changed into a prime (171172361) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 90750 + ... + 92616.

It is an arithmetic number, because the mean of its divisors is an integer number (10539256).

Almost surely, 2^171172161 is an apocalyptic number.

It is an amenable number.

171172161 is a deficient number, since it is larger than the sum of its proper divisors (81769983).

171172161 is a wasteful number, since it uses less digits than its factorization.

171172161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2101 (or 2098 counting only the distinct ones).

The product of its digits is 588, while the sum is 27.

The square root of 171172161 is about 13083.2779149569. The cubic root of 171172161 is about 555.2361206159.

The spelling of 171172161 in words is "one hundred seventy-one million, one hundred seventy-two thousand, one hundred sixty-one".