12217993 has 2 divisors, whose sum is σ = 12217994. Its totient is φ = 12217992.

The previous prime is 12217987. The next prime is 12218027. The reversal of 12217993 is 39971221.

It is a happy number.

It is an a-pointer prime, because the next prime (12218027) can be obtained adding 12217993 to its sum of digits (34).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12027024 + 190969 = 3468^2 + 437^2 .

It is a cyclic number.

It is not a de Polignac number, because 12217993 - 2⁹ = 12217481 is a prime.

It is not a weakly prime, because it can be changed into another prime (12217913) 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, 6108996 + 6108997.

It is an arithmetic number, because the mean of its divisors is an integer number (6108997).

Almost surely, 2^12217993 is an apocalyptic number.

It is an amenable number.

12217993 is a deficient number, since it is larger than the sum of its proper divisors (1).

12217993 is an equidigital number, since it uses as much as digits as its factorization.

12217993 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6804, while the sum is 34.

The square root of 12217993 is about 3495.4245807913. The cubic root of 12217993 is about 230.3208691030.

The spelling of 12217993 in words is "twelve million, two hundred seventeen thousand, nine hundred ninety-three".