12538716331 has 2 divisors, whose sum is σ = 12538716332. Its totient is φ = 12538716330.

The previous prime is 12538716329. The next prime is 12538716343. The reversal of 12538716331 is 13361783521.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 12538716331 - 2¹ = 12538716329 is a prime.

It is a super-2 number, since 2×12538716331² (a number of 21 digits) contains 22 as substring.

Together with 12538716329, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (12538716361) 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, 6269358165 + 6269358166.

It is an arithmetic number, because the mean of its divisors is an integer number (6269358166).

Almost surely, 2^12538716331 is an apocalyptic number.

12538716331 is a deficient number, since it is larger than the sum of its proper divisors (1).

12538716331 is an equidigital number, since it uses as much as digits as its factorization.

12538716331 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 90720, while the sum is 40.

The spelling of 12538716331 in words is "twelve billion, five hundred thirty-eight million, seven hundred sixteen thousand, three hundred thirty-one".