12543242639 has 2 divisors, whose sum is σ = 12543242640. Its totient is φ = 12543242638.

The previous prime is 12543242567. The next prime is 12543242729. The reversal of 12543242639 is 93624234521.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 12543242639 - 2¹⁶ = 12543177103 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12543242596 and 12543242605.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12543242339) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6271621319 + 6271621320.

It is an arithmetic number, because the mean of its divisors is an integer number (6271621320).

Almost surely, 2^12543242639 is an apocalyptic number.

12543242639 is a deficient number, since it is larger than the sum of its proper divisors (1).

12543242639 is an equidigital number, since it uses as much as digits as its factorization.

12543242639 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 311040, while the sum is 41.

The spelling of 12543242639 in words is "twelve billion, five hundred forty-three million, two hundred forty-two thousand, six hundred thirty-nine".