12543113449 has 2 divisors, whose sum is σ = 12543113450. Its totient is φ = 12543113448.

The previous prime is 12543113393. The next prime is 12543113489. The reversal of 12543113449 is 94431134521.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8842581225 + 3700532224 = 94035^2 + 60832^2 .

It is a cyclic number.

It is not a de Polignac number, because 12543113449 - 2¹¹ = 12543111401 is a prime.

It is not a weakly prime, because it can be changed into another prime (12543113489) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6271556724 + 6271556725.

It is an arithmetic number, because the mean of its divisors is an integer number (6271556725).

Almost surely, 2^12543113449 is an apocalyptic number.

It is an amenable number.

12543113449 is a deficient number, since it is larger than the sum of its proper divisors (1).

12543113449 is an equidigital number, since it uses as much as digits as its factorization.

12543113449 is an evil number, because the sum of its binary digits is even.

The product of its digits is 51840, while the sum is 37.

The spelling of 12543113449 in words is "twelve billion, five hundred forty-three million, one hundred thirteen thousand, four hundred forty-nine".