12543000243 has 16 divisors (see below), whose sum is σ = 16934067360. Its totient is φ = 8257213184.

The previous prime is 12543000209. The next prime is 12543000263. The reversal of 12543000243 is 34200034521.

It is a cyclic number.

It is not a de Polignac number, because 12543000243 - 2⁹ = 12542999731 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12543000263) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 176005 + ... + 236777.

It is an arithmetic number, because the mean of its divisors is an integer number (1058379210).

Almost surely, 2^12543000243 is an apocalyptic number.

12543000243 is a deficient number, since it is larger than the sum of its proper divisors (4391067117).

12543000243 is an equidigital number, since it uses as much as digits as its factorization.

12543000243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61638.

The product of its (nonzero) digits is 2880, while the sum is 24.

Adding to 12543000243 its reverse (34200034521), we get a palindrome (46743034764).

The spelling of 12543000243 in words is "twelve billion, five hundred forty-three million, two hundred forty-three", and thus it is an aban number.