12781272949 has 2 divisors, whose sum is σ = 12781272950. Its totient is φ = 12781272948.

The previous prime is 12781272923. The next prime is 12781272953. The reversal of 12781272949 is 94927218721.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8750292849 + 4030980100 = 93543^2 + 63490^2 .

It is a cyclic number.

It is not a de Polignac number, because 12781272949 - 2¹⁹ = 12780748661 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a junction number, because it is equal to n+sod(n) for n = 12781272896 and 12781272905.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12781272989) 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, 6390636474 + 6390636475.

It is an arithmetic number, because the mean of its divisors is an integer number (6390636475).

Almost surely, 2^12781272949 is an apocalyptic number.

It is an amenable number.

12781272949 is a deficient number, since it is larger than the sum of its proper divisors (1).

12781272949 is an equidigital number, since it uses as much as digits as its factorization.

12781272949 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1016064, while the sum is 52.

The spelling of 12781272949 in words is "twelve billion, seven hundred eighty-one million, two hundred seventy-two thousand, nine hundred forty-nine".