12891389129 has 4 divisors (see below), whose sum is σ = 12892701060. Its totient is φ = 12890077200.

The previous prime is 12891389123. The next prime is 12891389171. The reversal of 12891389129 is 92198319821.

It is a happy number.

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 6323907529 + 6567481600 = 79523^2 + 81040^2 .

It is a cyclic number.

It is not a de Polignac number, because 12891389129 - 2⁴ = 12891389113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12891389123) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 641114 + ... + 660915.

It is an arithmetic number, because the mean of its divisors is an integer number (3223175265).

Almost surely, 2^12891389129 is an apocalyptic number.

It is an amenable number.

12891389129 is a deficient number, since it is larger than the sum of its proper divisors (1311931).

12891389129 is an equidigital number, since it uses as much as digits as its factorization.

12891389129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1311930.

The product of its digits is 559872, while the sum is 53.

The spelling of 12891389129 in words is "twelve billion, eight hundred ninety-one million, three hundred eighty-nine thousand, one hundred twenty-nine".