12109217 has 2 divisors, whose sum is σ = 12109218. Its totient is φ = 12109216.

The previous prime is 12109183. The next prime is 12109231. The reversal of 12109217 is 71290121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12103441 + 5776 = 3479^2 + 76^2 .

It is a cyclic number.

It is not a de Polignac number, because 12109217 - 2⁸ = 12108961 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12109192 and 12109201.

It is not a weakly prime, because it can be changed into another prime (12109267) 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, 6054608 + 6054609.

It is an arithmetic number, because the mean of its divisors is an integer number (6054609).

Almost surely, 2^12109217 is an apocalyptic number.

It is an amenable number.

12109217 is a deficient number, since it is larger than the sum of its proper divisors (1).

12109217 is an equidigital number, since it uses as much as digits as its factorization.

12109217 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 252, while the sum is 23.

The square root of 12109217 is about 3479.8300245845. The cubic root of 12109217 is about 229.6353200023.

Adding to 12109217 its reverse (71290121), we get a palindrome (83399338).

The spelling of 12109217 in words is "twelve million, one hundred nine thousand, two hundred seventeen".