128171 has 4 divisors (see below), whose sum is σ = 130152. Its totient is φ = 126192.

The previous prime is 128159. The next prime is 128173. The reversal of 128171 is 171821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 171821 = 13 ⋅13217.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-128171 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128173) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 890 + ... + 1023.

It is an arithmetic number, because the mean of its divisors is an integer number (32538).

2¹²⁸¹⁷¹ is an apocalyptic number.

128171 is a deficient number, since it is larger than the sum of its proper divisors (1981).

128171 is an equidigital number, since it uses as much as digits as its factorization.

128171 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1980.

The product of its digits is 112, while the sum is 20.

The square root of 128171 is about 358.0097764028. The cubic root of 128171 is about 50.4192743531.

Adding to 128171 its reverse (171821), we get a palindrome (299992).

It can be divided in two parts, 1281 and 71, that multiplied together give a triangular number (90951 = T₄₂₆).

The spelling of 128171 in words is "one hundred twenty-eight thousand, one hundred seventy-one".