172671 has 4 divisors (see below), whose sum is σ = 230232. Its totient is φ = 115112.

The previous prime is 172663. The next prime is 172673. The reversal of 172671 is 176271.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 176271 = 3 ⋅58757.

It is a cyclic number.

It is not a de Polignac number, because 172671 - 2³ = 172663 is a prime.

It is a D-number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172673) 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, 28776 + ... + 28781.

It is an arithmetic number, because the mean of its divisors is an integer number (57558).

2¹⁷²⁶⁷¹ is an apocalyptic number.

172671 is a deficient number, since it is larger than the sum of its proper divisors (57561).

172671 is an equidigital number, since it uses as much as digits as its factorization.

172671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57560.

The product of its digits is 588, while the sum is 24.

The square root of 172671 is about 415.5370019625. The cubic root of 172671 is about 55.6852022529.

Subtracting 172671 from its reverse (176271), we obtain a square (3600 = 60²).

The spelling of 172671 in words is "one hundred seventy-two thousand, six hundred seventy-one".