12781441 has 2 divisors, whose sum is σ = 12781442. Its totient is φ = 12781440.

The previous prime is 12781429. The next prime is 12781451. The reversal of 12781441 is 14418721.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12250000 + 531441 = 3500^2 + 729^2 .

It is a cyclic number.

It is not a de Polignac number, because 12781441 - 2⁷ = 12781313 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (12781411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6390720 + 6390721.

It is an arithmetic number, because the mean of its divisors is an integer number (6390721).

Almost surely, 2^12781441 is an apocalyptic number.

It is an amenable number.

12781441 is a deficient number, since it is larger than the sum of its proper divisors (1).

12781441 is an equidigital number, since it uses as much as digits as its factorization.

12781441 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1792, while the sum is 28.

The square root of 12781441 is about 3575.1141240525. The cubic root of 12781441 is about 233.8083084447.

The spelling of 12781441 in words is "twelve million, seven hundred eighty-one thousand, four hundred forty-one".