16543 has 4 divisors (see below), whose sum is σ = 16848. Its totient is φ = 16240.

The previous prime is 16529. The next prime is 16547. The reversal of 16543 is 34561.

16543 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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16543 is a prime.

It is an Ulam number.

It is a d-powerful number, because it can be written as 1 + 6 + 5³ + 4⁷ + 3³ .

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a plaindrome in base 11.

It is a self number, because there is not a number n which added to its sum of digits gives 16543.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16547) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 46 + ... + 187.

It is an arithmetic number, because the mean of its divisors is an integer number (4212).

2¹⁶⁵⁴³ is an apocalyptic number.

16543 is a deficient number, since it is larger than the sum of its proper divisors (305).

16543 is an equidigital number, since it uses as much as digits as its factorization.

16543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 304.

The product of its digits is 360, while the sum is 19.

The square root of 16543 is about 128.6195941527. The cubic root of 16543 is about 25.4803128835.

The spelling of 16543 in words is "sixteen thousand, five hundred forty-three".