12638765431 has 2 divisors, whose sum is σ = 12638765432. Its totient is φ = 12638765430.

The previous prime is 12638765369. The next prime is 12638765437. The reversal of 12638765431 is 13456783621.

12638765431 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is an emirp because it is prime and its reverse (13456783621) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12638765431 - 2²³ = 12630376823 is a prime.

It is a super-2 number, since 2×12638765431² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12638765437) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6319382715 + 6319382716.

It is an arithmetic number, because the mean of its divisors is an integer number (6319382716).

Almost surely, 2^12638765431 is an apocalyptic number.

12638765431 is a deficient number, since it is larger than the sum of its proper divisors (1).

12638765431 is an equidigital number, since it uses as much as digits as its factorization.

12638765431 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 725760, while the sum is 46.

The spelling of 12638765431 in words is "twelve billion, six hundred thirty-eight million, seven hundred sixty-five thousand, four hundred thirty-one".