12981085389 has 12 divisors (see below), whose sum is σ = 18803578716. Its totient is φ = 8629539072.

The previous prime is 12981085331. The next prime is 12981085393. The reversal of 12981085389 is 98358018921.

12981085389 is a `hidden beast` number, since 1 + 2 + 98 + 10 + 8 + 538 + 9 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 2707641225 + 10273444164 = 52035^2 + 101358^2 .

It is not a de Polignac number, because 12981085389 - 2¹⁵ = 12981052621 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12981085309) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2039802 + ... + 2046155.

It is an arithmetic number, because the mean of its divisors is an integer number (1566964893).

Almost surely, 2^12981085389 is an apocalyptic number.

It is an amenable number.

12981085389 is a deficient number, since it is larger than the sum of its proper divisors (5822493327).

12981085389 is a wasteful number, since it uses less digits than its factorization.

12981085389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4086316 (or 4086313 counting only the distinct ones).

The product of its (nonzero) digits is 1244160, while the sum is 54.

The spelling of 12981085389 in words is "twelve billion, nine hundred eighty-one million, eighty-five thousand, three hundred eighty-nine".