12456217 has 2 divisors, whose sum is σ = 12456218. Its totient is φ = 12456216.

The previous prime is 12456211. The next prime is 12456221. The reversal of 12456217 is 71265421.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11397376 + 1058841 = 3376^2 + 1029^2 .

It is a cyclic number.

It is not a de Polignac number, because 12456217 - 2¹⁹ = 11931929 is a prime.

It is not a weakly prime, because it can be changed into another prime (12456211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6228108 + 6228109.

It is an arithmetic number, because the mean of its divisors is an integer number (6228109).

Almost surely, 2^12456217 is an apocalyptic number.

It is an amenable number.

12456217 is a deficient number, since it is larger than the sum of its proper divisors (1).

12456217 is an equidigital number, since it uses as much as digits as its factorization.

12456217 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3360, while the sum is 28.

The square root of 12456217 is about 3529.3366232197. The cubic root of 12456217 is about 231.8081611224.

The spelling of 12456217 in words is "twelve million, four hundred fifty-six thousand, two hundred seventeen".