129171 has 8 divisors (see below), whose sum is σ = 196864. Its totient is φ = 73800.

The previous prime is 129169. The next prime is 129187. The reversal of 129171 is 171921.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 129171 - 2¹ = 129169 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21), and also a Moran number because the ratio is a prime number: 6151 = 129171 / (1 + 2 + 9 + 1 + 7 + 1).

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 129171.

It is not an unprimeable number, because it can be changed into a prime (129121) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3055 + ... + 3096.

It is an arithmetic number, because the mean of its divisors is an integer number (24608).

2¹²⁹¹⁷¹ is an apocalyptic number.

129171 is a deficient number, since it is larger than the sum of its proper divisors (67693).

129171 is an equidigital number, since it uses as much as digits as its factorization.

129171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6161.

The product of its digits is 126, while the sum is 21.

The square root of 129171 is about 359.4036727692. The cubic root of 129171 is about 50.5500598265.

It can be divided in two parts, 129 and 171, that added together give a triangular number (300 = T₂₄).

The spelling of 129171 in words is "one hundred twenty-nine thousand, one hundred seventy-one".