171208129 has 4 divisors (see below), whose sum is σ = 171378820. Its totient is φ = 171037440.

The previous prime is 171208123. The next prime is 171208157. The reversal of 171208129 is 921802171.

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

It can be written as a sum of positive squares in 2 ways, for example, as 68145025 + 103063104 = 8255^2 + 10152^2 .

It is a cyclic number.

It is not a de Polignac number, because 171208129 - 2⁵ = 171208097 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 171208129.

It is not an unprimeable number, because it can be changed into a prime (171208123) 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, 83832 + ... + 85849.

It is an arithmetic number, because the mean of its divisors is an integer number (42844705).

Almost surely, 2^171208129 is an apocalyptic number.

It is an amenable number.

171208129 is a deficient number, since it is larger than the sum of its proper divisors (170691).

171208129 is a wasteful number, since it uses less digits than its factorization.

171208129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 170690.

The product of its (nonzero) digits is 2016, while the sum is 31.

The square root of 171208129 is about 13084.6524218261. The cubic root of 171208129 is about 555.2750080418.

The spelling of 171208129 in words is "one hundred seventy-one million, two hundred eight thousand, one hundred twenty-nine".