12646217 has 2 divisors, whose sum is σ = 12646218. Its totient is φ = 12646216.

The previous prime is 12646189. The next prime is 12646219. The reversal of 12646217 is 71264621.

12646217 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11215801 + 1430416 = 3349^2 + 1196^2 .

It is a cyclic number.

It is not a de Polignac number, because 12646217 - 2¹² = 12642121 is a prime.

It is a super-2 number, since 2×12646217² = 319853608822178, which contains 22 as substring.

Together with 12646219, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12646217.

It is not a weakly prime, because it can be changed into another prime (12646219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6323108 + 6323109.

It is an arithmetic number, because the mean of its divisors is an integer number (6323109).

Almost surely, 2^12646217 is an apocalyptic number.

It is an amenable number.

12646217 is a deficient number, since it is larger than the sum of its proper divisors (1).

12646217 is an equidigital number, since it uses as much as digits as its factorization.

12646217 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4032, while the sum is 29.

The square root of 12646217 is about 3556.1519933771. The cubic root of 12646217 is about 232.9808416895.

The spelling of 12646217 in words is "twelve million, six hundred forty-six thousand, two hundred seventeen".