12217987 has 2 divisors, whose sum is σ = 12217988. Its totient is φ = 12217986.

The previous prime is 12217957. The next prime is 12217993. The reversal of 12217987 is 78971221.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 12217987 - 2⁷ = 12217859 is a prime.

It is not a weakly prime, because it can be changed into another prime (12217957) 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 as a sum of consecutive naturals, namely, 6108993 + 6108994.

It is an arithmetic number, because the mean of its divisors is an integer number (6108994).

Almost surely, 2^12217987 is an apocalyptic number.

12217987 is a deficient number, since it is larger than the sum of its proper divisors (1).

12217987 is an equidigital number, since it uses as much as digits as its factorization.

12217987 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 14112, while the sum is 37.

The square root of 12217987 is about 3495.4237225264. The cubic root of 12217987 is about 230.3208314011.

The spelling of 12217987 in words is "twelve million, two hundred seventeen thousand, nine hundred eighty-seven".