12543314549 has 2 divisors, whose sum is σ = 12543314550. Its totient is φ = 12543314548.

The previous prime is 12543314543. The next prime is 12543314587. The reversal of 12543314549 is 94541334521.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8483331025 + 4059983524 = 92105^2 + 63718^2 .

It is a cyclic number.

It is not a de Polignac number, because 12543314549 - 2³² = 8248347253 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12543314543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6271657274 + 6271657275.

It is an arithmetic number, because the mean of its divisors is an integer number (6271657275).

Almost surely, 2^12543314549 is an apocalyptic number.

It is an amenable number.

12543314549 is a deficient number, since it is larger than the sum of its proper divisors (1).

12543314549 is an equidigital number, since it uses as much as digits as its factorization.

12543314549 is an evil number, because the sum of its binary digits is even.

The product of its digits is 259200, while the sum is 41.

The spelling of 12543314549 in words is "twelve billion, five hundred forty-three million, three hundred fourteen thousand, five hundred forty-nine".