12239271817 has 2 divisors, whose sum is σ = 12239271818. Its totient is φ = 12239271816.

The previous prime is 12239271797. The next prime is 12239271871. The reversal of 12239271817 is 71817293221.

12239271817 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

Together with next prime (12239271871) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11993754256 + 245517561 = 109516^2 + 15669^2 .

It is an emirp because it is prime and its reverse (71817293221) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12239271817 - 2¹¹ = 12239269769 is a prime.

It is a super-2 number, since 2×12239271817² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (12239871817) 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, 6119635908 + 6119635909.

It is an arithmetic number, because the mean of its divisors is an integer number (6119635909).

Almost surely, 2^12239271817 is an apocalyptic number.

It is an amenable number.

12239271817 is a deficient number, since it is larger than the sum of its proper divisors (1).

12239271817 is an equidigital number, since it uses as much as digits as its factorization.

12239271817 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 84672, while the sum is 43.

The spelling of 12239271817 in words is "twelve billion, two hundred thirty-nine million, two hundred seventy-one thousand, eight hundred seventeen".