12912187 has 2 divisors, whose sum is σ = 12912188. Its totient is φ = 12912186.

The previous prime is 12912157. The next prime is 12912199. The reversal of 12912187 is 78121921.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 12912187 - 2²³ = 4523579 is a prime.

It is not a weakly prime, because it can be changed into another prime (12912157) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6456093 + 6456094.

It is an arithmetic number, because the mean of its divisors is an integer number (6456094).

Almost surely, 2^12912187 is an apocalyptic number.

12912187 is a deficient number, since it is larger than the sum of its proper divisors (1).

12912187 is an equidigital number, since it uses as much as digits as its factorization.

12912187 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2016, while the sum is 31.

The square root of 12912187 is about 3593.3531693948. The cubic root of 12912187 is about 234.6028420696.

The spelling of 12912187 in words is "twelve million, nine hundred twelve thousand, one hundred eighty-seven".