12344011781 has 2 divisors, whose sum is σ = 12344011782. Its totient is φ = 12344011780.

The previous prime is 12344011699. The next prime is 12344011783. The reversal of 12344011781 is 18711044321.

12344011781 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 can be written as a sum of positive squares in only one way, i.e., 12262018756 + 81993025 = 110734^2 + 9055^2 .

It is an emirp because it is prime and its reverse (18711044321) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12344011781 - 2²⁶ = 12276902917 is a prime.

It is a super-2 number, since 2×12344011781² (a number of 21 digits) contains 22 as substring.

Together with 12344011783, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12344011783) 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, 6172005890 + 6172005891.

It is an arithmetic number, because the mean of its divisors is an integer number (6172005891).

Almost surely, 2^12344011781 is an apocalyptic number.

It is an amenable number.

12344011781 is a deficient number, since it is larger than the sum of its proper divisors (1).

12344011781 is an equidigital number, since it uses as much as digits as its factorization.

12344011781 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5376, while the sum is 32.

The spelling of 12344011781 in words is "twelve billion, three hundred forty-four million, eleven thousand, seven hundred eighty-one".