543 is nontrivially palindromic in base 11 and base 12.
543 is an esthetic number in base 10 and base 11, because in such bases its adjacent digits differ by 1.
It is a semiprime because it is the product of two primes.
It is a D-number.
It is an alternating number because its digits alternate between odd and even.
It is a Duffinian number.
543 is an undulating number in base 11 and base 12.
It is a straight-line number, since its digits are in arithmetic progression.
It is a plaindrome in base 14.
It is a nialpdrome in base 9 and base 10.
It is a congruent number.
It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 543.
543 is a wasteful number, since it uses less digits than its factorization.
543 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 184.
The square root of 543 is about 23.3023603955. The cubic root of 543 is about 8.1583051074.
Adding to 543 its sum of digits (12), we get a palindrome (555).
Adding to 543 its reverse (345), we get a palindrome (888).
The spelling of 543 in words is "five hundred forty-three", and thus it is an aban number.