12543 has 8 divisors (see below), whose sum is σ = 17328. Its totient is φ = 8064.

The previous prime is 12541. The next prime is 12547. The reversal of 12543 is 34521.

It is a Cunningham number, because it is equal to 112²-1.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 12543 - 2¹ = 12541 is a prime.

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

12543 is a lucky number.

It is a plaindrome in base 14.

It is a zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12541) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 55 + ... + 167.

It is an arithmetic number, because the mean of its divisors is an integer number (2166).

2¹²⁵⁴³ is an apocalyptic number.

12543 is a deficient number, since it is larger than the sum of its proper divisors (4785).

12543 is a wasteful number, since it uses less digits than its factorization.

12543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 153.

The product of its digits is 120, while the sum is 15.

The square root of 12543 is about 111.9955356253. The cubic root of 12543 is about 23.2345254874.

It can be divided in two parts, 12 and 543, that added together give a palindrome (555).

The spelling of 12543 in words is "twelve thousand, five hundred forty-three".