12871138109 has 2 divisors, whose sum is σ = 12871138110. Its totient is φ = 12871138108.

The previous prime is 12871138103. The next prime is 12871138171. The reversal of 12871138109 is 90183117821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11898010084 + 973128025 = 109078^2 + 31195^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12871138109 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12871138103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6435569054 + 6435569055.

It is an arithmetic number, because the mean of its divisors is an integer number (6435569055).

Almost surely, 2^12871138109 is an apocalyptic number.

It is an amenable number.

12871138109 is a deficient number, since it is larger than the sum of its proper divisors (1).

12871138109 is an equidigital number, since it uses as much as digits as its factorization.

12871138109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24192, while the sum is 41.

The spelling of 12871138109 in words is "twelve billion, eight hundred seventy-one million, one hundred thirty-eight thousand, one hundred nine".