12781103 has 2 divisors, whose sum is σ = 12781104. Its totient is φ = 12781102.

The previous prime is 12781081. The next prime is 12781117. The reversal of 12781103 is 30118721.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (30118721) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12781103 - 2¹⁸ = 12518959 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12781183) 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, 6390551 + 6390552.

It is an arithmetic number, because the mean of its divisors is an integer number (6390552).

Almost surely, 2^12781103 is an apocalyptic number.

12781103 is a deficient number, since it is larger than the sum of its proper divisors (1).

12781103 is an equidigital number, since it uses as much as digits as its factorization.

12781103 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 336, while the sum is 23.

The square root of 12781103 is about 3575.0668525218. The cubic root of 12781103 is about 233.8062474381.

Adding to 12781103 its reverse (30118721), we get a palindrome (42899824).

The spelling of 12781103 in words is "twelve million, seven hundred eighty-one thousand, one hundred three".