12781091087 has 2 divisors, whose sum is σ = 12781091088. Its totient is φ = 12781091086.

The previous prime is 12781091039. The next prime is 12781091119. The reversal of 12781091087 is 78019018721.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 12781091087 - 2²⁰ = 12780042511 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12781091017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6390545543 + 6390545544.

It is an arithmetic number, because the mean of its divisors is an integer number (6390545544).

Almost surely, 2^12781091087 is an apocalyptic number.

12781091087 is a deficient number, since it is larger than the sum of its proper divisors (1).

12781091087 is an equidigital number, since it uses as much as digits as its factorization.

12781091087 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 56448, while the sum is 44.

The spelling of 12781091087 in words is "twelve billion, seven hundred eighty-one million, ninety-one thousand, eighty-seven".