171959 has 4 divisors (see below), whose sum is σ = 174840. Its totient is φ = 169080.

The previous prime is 171947. The next prime is 172001. The reversal of 171959 is 959171.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 959171 = 31 ⋅30941.

It is a cyclic number.

It is not a de Polignac number, because 171959 - 2¹² = 167863 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 171959.

It is not an unprimeable number, because it can be changed into a prime (171929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1349 + ... + 1470.

It is an arithmetic number, because the mean of its divisors is an integer number (43710).

2¹⁷¹⁹⁵⁹ is an apocalyptic number.

171959 is a deficient number, since it is larger than the sum of its proper divisors (2881).

171959 is an equidigital number, since it uses as much as digits as its factorization.

171959 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2880.

The product of its digits is 2835, while the sum is 32.

The square root of 171959 is about 414.6793942313. The cubic root of 171959 is about 55.6085584534.

Adding to 171959 its sum of digits (32), we get a triangular number (171991 = T₅₈₆).

The spelling of 171959 in words is "one hundred seventy-one thousand, nine hundred fifty-nine".