165171 has 4 divisors (see below), whose sum is σ = 220232. Its totient is φ = 110112.

The previous prime is 165161. The next prime is 165173. The reversal of 165171 is 171561.

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

It is not a de Polignac number, because 165171 - 2¹⁰ = 164147 is a prime.

It is an Ulam number.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165173) 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, 27526 + ... + 27531.

It is an arithmetic number, because the mean of its divisors is an integer number (55058).

2¹⁶⁵¹⁷¹ is an apocalyptic number.

165171 is a deficient number, since it is larger than the sum of its proper divisors (55061).

165171 is an equidigital number, since it uses as much as digits as its factorization.

165171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55060.

The product of its digits is 210, while the sum is 21.

The square root of 165171 is about 406.4123521745. The cubic root of 165171 is about 54.8670064961.

The spelling of 165171 in words is "one hundred sixty-five thousand, one hundred seventy-one".