12617321 has 2 divisors, whose sum is σ = 12617322. Its totient is φ = 12617320.

The previous prime is 12617309. The next prime is 12617357. The reversal of 12617321 is 12371621.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12075625 + 541696 = 3475^2 + 736^2 .

It is a cyclic number.

It is not a de Polignac number, because 12617321 - 2⁶ = 12617257 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (12617221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6308660 + 6308661.

It is an arithmetic number, because the mean of its divisors is an integer number (6308661).

Almost surely, 2^12617321 is an apocalyptic number.

It is an amenable number.

12617321 is a deficient number, since it is larger than the sum of its proper divisors (1).

12617321 is an equidigital number, since it uses as much as digits as its factorization.

12617321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 504, while the sum is 23.

The square root of 12617321 is about 3552.0868514157. The cubic root of 12617321 is about 232.8032563421.

Adding to 12617321 its reverse (12371621), we get a palindrome (24988942).

The spelling of 12617321 in words is "twelve million, six hundred seventeen thousand, three hundred twenty-one".