12887989889 has 4 divisors (see below), whose sum is σ = 12897762240. Its totient is φ = 12878217540.

The previous prime is 12887989853. The next prime is 12887989909. The reversal of 12887989889 is 98898978821.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 98898978821 = 60343 ⋅1638947.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12887989889 is a prime.

It is a super-2 number, since 2×12887989889² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12887989189) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4884197 + ... + 4886834.

It is an arithmetic number, because the mean of its divisors is an integer number (3224440560).

Almost surely, 2^12887989889 is an apocalyptic number.

It is an amenable number.

12887989889 is a deficient number, since it is larger than the sum of its proper divisors (9772351).

12887989889 is an equidigital number, since it uses as much as digits as its factorization.

12887989889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9772350.

The product of its digits is 334430208, while the sum is 77.

The spelling of 12887989889 in words is "twelve billion, eight hundred eighty-seven million, nine hundred eighty-nine thousand, eight hundred eighty-nine".