2543 has 2 divisors, whose sum is σ = 2544.
Its totient is φ = 2542.
The previous prime is 2539. The next prime is 2549. The reversal of 2543 is 3452.
Added to its reverse (3452) it gives a triangular number (5995 = T109).
It is a weak prime.
It is a cyclic number.
It is not a de Polignac number, because 2543 - 22 = 2539 is a prime.
It is a Sophie Germain prime.
It is a Chen prime.
It is an alternating number because its digits alternate between even and odd.
It is a plaindrome in base 12 and base 16.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (2549) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1271 + 1272.
It is an arithmetic number, because the mean of its divisors is an integer number (1272).
22543 is an apocalyptic number.
2543 is a deficient number, since it is larger than the sum of its proper divisors (1).
2543 is an equidigital number, since it uses as much as digits as its factorization.
2543 is an odious number, because the sum of its binary digits is odd.
The product of its digits is 120, while the sum is 14.
The square root of 2543 is about 50.4281667325.
The cubic root of 2543 is about 13.6494594731.
Adding to 2543 its reverse (3452), we get a palindrome (5995).
Subtracting 2543 from its reverse (3452), we obtain a palindrome (909).
It can be divided in two parts, 2 and 543, that added together give a palindrome (545).
The spelling of 2543 in words is "two thousand, five hundred forty-three".