4243 has 2 divisors, whose sum is σ = 4244.
Its totient is φ = 4242.
The previous prime is 4241. The next prime is 4253. The reversal of 4243 is 3424.
It is a weak prime.
It is a cyclic number.
It is not a de Polignac number, because 4243 - 21 = 4241 is a prime.
Together with 4241, it forms a pair of twin primes.
It is a d-powerful number, because it can be written as 4 + 4 + 211 + 37 .
It is a plaindrome in base 12 and base 15.
It is not a weakly prime, because it can be changed into another prime (4241) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (5) of ones.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2121 + 2122.
It is an arithmetic number, because the mean of its divisors is an integer number (2122).
4243 is a deficient number, since it is larger than the sum of its proper divisors (1).
4243 is an equidigital number, since it uses as much as digits as its factorization.
4243 is an odious number, because the sum of its binary digits is odd.
The product of its digits is 96, while the sum is 13.
The square root of 4243 is about 65.1383143779.
The cubic root of 4243 is about 16.1891610675.
Adding to 4243 its reverse (3424), we get a palindrome (7667).
The spelling of 4243 in words is "four thousand, two hundred forty-three", and thus it is an iban number.