12323981 has 2 divisors, whose sum is σ = 12323982. Its totient is φ = 12323980.

The previous prime is 12323977. The next prime is 12323999. The reversal of 12323981 is 18932321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12187081 + 136900 = 3491^2 + 370^2 .

It is an emirp because it is prime and its reverse (18932321) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12323981 - 2² = 12323977 is a prime.

It is a super-2 number, since 2×12323981² = 303761015376722, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12323911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6161990 + 6161991.

It is an arithmetic number, because the mean of its divisors is an integer number (6161991).

Almost surely, 2^12323981 is an apocalyptic number.

It is an amenable number.

12323981 is a deficient number, since it is larger than the sum of its proper divisors (1).

12323981 is an equidigital number, since it uses as much as digits as its factorization.

12323981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2592, while the sum is 29.

The square root of 12323981 is about 3510.5528054710. The cubic root of 12323981 is about 230.9849443284.

The spelling of 12323981 in words is "twelve million, three hundred twenty-three thousand, nine hundred eighty-one".