12187927291 has 2 divisors, whose sum is σ = 12187927292. Its totient is φ = 12187927290.

The previous prime is 12187927277. The next prime is 12187927313. The reversal of 12187927291 is 19272978121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 12187927291 - 2⁵ = 12187927259 is a prime.

It is not a weakly prime, because it can be changed into another prime (12187927261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6093963645 + 6093963646.

It is an arithmetic number, because the mean of its divisors is an integer number (6093963646).

Almost surely, 2^12187927291 is an apocalyptic number.

12187927291 is a deficient number, since it is larger than the sum of its proper divisors (1).

12187927291 is an equidigital number, since it uses as much as digits as its factorization.

12187927291 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 254016, while the sum is 49.

The spelling of 12187927291 in words is "twelve billion, one hundred eighty-seven million, nine hundred twenty-seven thousand, two hundred ninety-one".