156171 has 4 divisors (see below), whose sum is σ = 208232. Its totient is φ = 104112.

The previous prime is 156157. The next prime is 156217. The reversal of 156171 is 171651.

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

It is not a de Polignac number, because 156171 - 2⁵ = 156139 is a prime.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (156131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26026 + ... + 26031.

It is an arithmetic number, because the mean of its divisors is an integer number (52058).

2¹⁵⁶¹⁷¹ is an apocalyptic number.

156171 is a deficient number, since it is larger than the sum of its proper divisors (52061).

156171 is an equidigital number, since it uses as much as digits as its factorization.

156171 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52060.

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

The square root of 156171 is about 395.1847669129. The cubic root of 156171 is about 53.8517883690.

Subtracting from 156171 its product of digits (210), we obtain a triangular number (155961 = T₅₅₈).

The spelling of 156171 in words is "one hundred fifty-six thousand, one hundred seventy-one".