172543 has 6 divisors (see below), whose sum is σ = 198456. Its totient is φ = 146952.

The previous prime is 172541. The next prime is 172553. The reversal of 172543 is 345271.

It is not a de Polignac number, because 172543 - 2¹ = 172541 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 (172541) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1021 + ... + 1177.

It is an arithmetic number, because the mean of its divisors is an integer number (33076).

172543 is a Friedman number, since it can be written as 7*(153+4)^2, using all its digits and the basic arithmetic operations.

2¹⁷²⁵⁴³ is an apocalyptic number.

172543 is a deficient number, since it is larger than the sum of its proper divisors (25913).

172543 is an frugal number, since it uses more digits than its factorization.

172543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 321 (or 164 counting only the distinct ones).

The product of its digits is 840, while the sum is 22.

The square root of 172543 is about 415.3829558371. The cubic root of 172543 is about 55.6714391468.

The spelling of 172543 in words is "one hundred seventy-two thousand, five hundred forty-three".