12111131987 has 8 divisors (see below), whose sum is σ = 12516497280. Its totient is φ = 11706684480.

The previous prime is 12111131917. The next prime is 12111132001. The reversal of 12111131987 is 78913111121.

12111131987 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12111131987 - 2¹⁰ = 12111130963 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12111131917) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 202562 + ... + 255447.

It is an arithmetic number, because the mean of its divisors is an integer number (1564562160).

Almost surely, 2^12111131987 is an apocalyptic number.

12111131987 is a deficient number, since it is larger than the sum of its proper divisors (405365293).

12111131987 is an equidigital number, since it uses as much as digits as its factorization.

12111131987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 458893.

The product of its digits is 3024, while the sum is 35.

The spelling of 12111131987 in words is "twelve billion, one hundred eleven million, one hundred thirty-one thousand, nine hundred eighty-seven".