13543 has 4 divisors (see below), whose sum is σ = 14040. Its totient is φ = 13048.

The previous prime is 13537. The next prime is 13553. The reversal of 13543 is 34531.

13543 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34531 = 7 ⋅4933.

It is a cyclic number.

It is not a de Polignac number, because 13543 - 2¹³ = 5351 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 (13513) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 205 + ... + 262.

It is an arithmetic number, because the mean of its divisors is an integer number (3510).

2¹³⁵⁴³ is an apocalyptic number.

13543 is a deficient number, since it is larger than the sum of its proper divisors (497).

13543 is an equidigital number, since it uses as much as digits as its factorization.

13543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 496.

The product of its digits is 180, while the sum is 16.

The square root of 13543 is about 116.3743958094. The cubic root of 13543 is about 23.8362698171.

The spelling of 13543 in words is "thirteen thousand, five hundred forty-three".