12871398194891 has 4 divisors (see below), whose sum is σ = 12871684455384. Its totient is φ = 12871111934400.

The previous prime is 12871398194887. The next prime is 12871398194903. The reversal of 12871398194891 is 19849189317821.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 12871398194891 - 2² = 12871398194887 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12871398194791) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 143062790 + ... + 143152731.

It is an arithmetic number, because the mean of its divisors is an integer number (3217921113846).

Almost surely, 2^{12871398194891} is an apocalyptic number.

12871398194891 is a deficient number, since it is larger than the sum of its proper divisors (286260493).

12871398194891 is an equidigital number, since it uses as much as digits as its factorization.

12871398194891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 286260492.

The product of its digits is 62705664, while the sum is 71.

The spelling of 12871398194891 in words is "twelve trillion, eight hundred seventy-one billion, three hundred ninety-eight million, one hundred ninety-four thousand, eight hundred ninety-one".