12218329 has 2 divisors, whose sum is σ = 12218330. Its totient is φ = 12218328.

The previous prime is 12218299. The next prime is 12218333. The reversal of 12218329 is 92381221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8880400 + 3337929 = 2980^2 + 1827^2 .

It is an emirp because it is prime and its reverse (92381221) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12218329 - 2⁷ = 12218201 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12218297 and 12218306.

It is not a weakly prime, because it can be changed into another prime (12218629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6109164 + 6109165.

It is an arithmetic number, because the mean of its divisors is an integer number (6109165).

Almost surely, 2^12218329 is an apocalyptic number.

It is an amenable number.

12218329 is a deficient number, since it is larger than the sum of its proper divisors (1).

12218329 is an equidigital number, since it uses as much as digits as its factorization.

12218329 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1728, while the sum is 28.

The square root of 12218329 is about 3495.4726432916. The cubic root of 12218329 is about 230.3229803909.

The spelling of 12218329 in words is "twelve million, two hundred eighteen thousand, three hundred twenty-nine".