12381641 has 2 divisors, whose sum is σ = 12381642. Its totient is φ = 12381640.

The previous prime is 12381599. The next prime is 12381689. The reversal of 12381641 is 14618321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6760000 + 5621641 = 2600^2 + 2371^2 .

It is an emirp because it is prime and its reverse (14618321) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12381641 - 2¹⁰ = 12380617 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 12381641.

It is not a weakly prime, because it can be changed into another prime (12381041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6190820 + 6190821.

It is an arithmetic number, because the mean of its divisors is an integer number (6190821).

Almost surely, 2^12381641 is an apocalyptic number.

It is an amenable number.

12381641 is a deficient number, since it is larger than the sum of its proper divisors (1).

12381641 is an equidigital number, since it uses as much as digits as its factorization.

12381641 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1152, while the sum is 26.

The square root of 12381641 is about 3518.7556039032. The cubic root of 12381641 is about 231.3446190838.

Adding to 12381641 its reverse (14618321), we get a palindrome (26999962).

The spelling of 12381641 in words is "twelve million, three hundred eighty-one thousand, six hundred forty-one".