171973 has 4 divisors (see below), whose sum is σ = 175680. Its totient is φ = 168268.

The previous prime is 171947. The next prime is 172001. The reversal of 171973 is 379171.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 379171 = 13 ⋅29167.

It is a cyclic number.

It is not a de Polignac number, because 171973 - 2¹³ = 163781 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (171923) 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, 1783 + ... + 1876.

It is an arithmetic number, because the mean of its divisors is an integer number (43920).

2¹⁷¹⁹⁷³ is an apocalyptic number.

It is an amenable number.

171973 is a deficient number, since it is larger than the sum of its proper divisors (3707).

171973 is an equidigital number, since it uses as much as digits as its factorization.

171973 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3706.

The product of its digits is 1323, while the sum is 28.

The square root of 171973 is about 414.6962743985. The cubic root of 171973 is about 55.6100675315.

The spelling of 171973 in words is "one hundred seventy-one thousand, nine hundred seventy-three".