12871309085 has 4 divisors (see below), whose sum is σ = 15445570908. Its totient is φ = 10297047264.

The previous prime is 12871309049. The next prime is 12871309169. The reversal of 12871309085 is 58090317821.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1306027321 + 11565281764 = 36139^2 + 107542^2 .

It is a cyclic number.

It is not a de Polignac number, because 12871309085 - 2⁶ = 12871309021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1287130904 + ... + 1287130913.

It is an arithmetic number, because the mean of its divisors is an integer number (3861392727).

Almost surely, 2^12871309085 is an apocalyptic number.

It is an amenable number.

12871309085 is a deficient number, since it is larger than the sum of its proper divisors (2574261823).

12871309085 is an equidigital number, since it uses as much as digits as its factorization.

12871309085 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2574261822.

The product of its (nonzero) digits is 120960, while the sum is 44.

The spelling of 12871309085 in words is "twelve billion, eight hundred seventy-one million, three hundred nine thousand, eighty-five".