12781091039 has 2 divisors, whose sum is σ = 12781091040. Its totient is φ = 12781091038.

The previous prime is 12781091027. The next prime is 12781091087. The reversal of 12781091039 is 93019018721.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12781091039 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12781090987 and 12781091005.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12781091009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6390545519 + 6390545520.

It is an arithmetic number, because the mean of its divisors is an integer number (6390545520).

Almost surely, 2^12781091039 is an apocalyptic number.

12781091039 is a deficient number, since it is larger than the sum of its proper divisors (1).

12781091039 is an equidigital number, since it uses as much as digits as its factorization.

12781091039 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 27216, while the sum is 41.

The spelling of 12781091039 in words is "twelve billion, seven hundred eighty-one million, ninety-one thousand, thirty-nine".