12215317 has 2 divisors, whose sum is σ = 12215318. Its totient is φ = 12215316.

The previous prime is 12215297. The next prime is 12215321. The reversal of 12215317 is 71351221.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11771761 + 443556 = 3431^2 + 666^2 .

It is a cyclic number.

It is not a de Polignac number, because 12215317 - 2¹¹ = 12213269 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12215327) 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, 6107658 + 6107659.

It is an arithmetic number, because the mean of its divisors is an integer number (6107659).

Almost surely, 2^12215317 is an apocalyptic number.

It is an amenable number.

12215317 is a deficient number, since it is larger than the sum of its proper divisors (1).

12215317 is an equidigital number, since it uses as much as digits as its factorization.

12215317 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 420, while the sum is 22.

The square root of 12215317 is about 3495.0417737132. The cubic root of 12215317 is about 230.3040528210.

Adding to 12215317 its reverse (71351221), we get a palindrome (83566538).

The spelling of 12215317 in words is "twelve million, two hundred fifteen thousand, three hundred seventeen".