12218587 has 2 divisors, whose sum is σ = 12218588. Its totient is φ = 12218586.

The previous prime is 12218537. The next prime is 12218611. The reversal of 12218587 is 78581221.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 12218587 - 2¹¹ = 12216539 is a prime.

It is a zygodrome in base 5.

It is not a weakly prime, because it can be changed into another prime (12218527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6109293 + 6109294.

It is an arithmetic number, because the mean of its divisors is an integer number (6109294).

Almost surely, 2^12218587 is an apocalyptic number.

12218587 is a deficient number, since it is larger than the sum of its proper divisors (1).

12218587 is an equidigital number, since it uses as much as digits as its factorization.

12218587 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8960, while the sum is 34.

The square root of 12218587 is about 3495.5095479772. The cubic root of 12218587 is about 230.3246015321.

The spelling of 12218587 in words is "twelve million, two hundred eighteen thousand, five hundred eighty-seven".