43543 has 2 divisors, whose sum is σ = 43544. Its totient is φ = 43542.

The previous prime is 43541. The next prime is 43573. The reversal of 43543 is 34534.

43543 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 43543 - 2¹ = 43541 is a prime.

Together with 43541, it forms a pair of twin primes.

43543 is a lucky number.

It is equal to p₄₅₃₇ and since 43543 and 4537 have the same sum of digits, it is a Honaker prime.

It is a nialpdrome in base 6.

It is a self number, because there is not a number n which added to its sum of digits gives 43543.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21771 + 21772.

It is an arithmetic number, because the mean of its divisors is an integer number (21772).

2⁴³⁵⁴³ is an apocalyptic number.

43543 is a deficient number, since it is larger than the sum of its proper divisors (1).

43543 is an equidigital number, since it uses as much as digits as its factorization.

43543 is an evil number, because the sum of its binary digits is even.

The product of its digits is 720, while the sum is 19.

The square root of 43543 is about 208.6695952936. The cubic root of 43543 is about 35.1808327984.

Subtracting from 43543 its reverse (34534), we obtain a palindrome (9009).

The spelling of 43543 in words is "forty-three thousand, five hundred forty-three".