12171617 has 2 divisors, whose sum is σ = 12171618. Its totient is φ = 12171616.

The previous prime is 12171589. The next prime is 12171659. The reversal of 12171617 is 71617121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10214416 + 1957201 = 3196^2 + 1399^2 .

It is a cyclic number.

It is not a de Polignac number, because 12171617 - 2⁸ = 12171361 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (12171697) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6085808 + 6085809.

It is an arithmetic number, because the mean of its divisors is an integer number (6085809).

Almost surely, 2^12171617 is an apocalyptic number.

It is an amenable number.

12171617 is a deficient number, since it is larger than the sum of its proper divisors (1).

12171617 is an equidigital number, since it uses as much as digits as its factorization.

12171617 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 588, while the sum is 26.

The square root of 12171617 is about 3488.7844588051. The cubic root of 12171617 is about 230.0290889485.

Adding to 12171617 its reverse (71617121), we get a palindrome (83788738).

The spelling of 12171617 in words is "twelve million, one hundred seventy-one thousand, six hundred seventeen".