12218617 has 2 divisors, whose sum is σ = 12218618. Its totient is φ = 12218616.

The previous prime is 12218611. The next prime is 12218623. The reversal of 12218617 is 71681221.

It is a balanced prime because it is at equal distance from previous prime (12218611) and next prime (12218623).

It can be written as a sum of positive squares in only one way, i.e., 11634921 + 583696 = 3411^2 + 764^2 .

It is an emirp because it is prime and its reverse (71681221) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12218617 - 2⁷ = 12218489 is a prime.

It is a super-3 number, since 3×12218617³ (a number of 22 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (12218611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6109308 + 6109309.

It is an arithmetic number, because the mean of its divisors is an integer number (6109309).

Almost surely, 2^12218617 is an apocalyptic number.

It is an amenable number.

12218617 is a deficient number, since it is larger than the sum of its proper divisors (1).

12218617 is an equidigital number, since it uses as much as digits as its factorization.

12218617 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1344, while the sum is 28.

The square root of 12218617 is about 3495.5138391945. The cubic root of 12218617 is about 230.3247900355.

Adding to 12218617 its reverse (71681221), we get a palindrome (83899838).

The spelling of 12218617 in words is "twelve million, two hundred eighteen thousand, six hundred seventeen".