1217199617 has 2 divisors, whose sum is σ = 1217199618. Its totient is φ = 1217199616.

The previous prime is 1217199611. The next prime is 1217199703. The reversal of 1217199617 is 7169917121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 850247281 + 366952336 = 29159^2 + 19156^2 .

It is a cyclic number.

It is not a de Polignac number, because 1217199617 - 2⁴ = 1217199601 is a prime.

It is not a weakly prime, because it can be changed into another prime (1217199611) 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, 608599808 + 608599809.

It is an arithmetic number, because the mean of its divisors is an integer number (608599809).

Almost surely, 2^1217199617 is an apocalyptic number.

It is an amenable number.

1217199617 is a deficient number, since it is larger than the sum of its proper divisors (1).

1217199617 is an equidigital number, since it uses as much as digits as its factorization.

1217199617 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 47628, while the sum is 44.

The square root of 1217199617 is about 34888.3879965813. The cubic root of 1217199617 is about 1067.7115375494.

The spelling of 1217199617 in words is "one billion, two hundred seventeen million, one hundred ninety-nine thousand, six hundred seventeen".