217226173238609 has 2 divisors, whose sum is σ = 217226173238610. Its totient is φ = 217226173238608.

The previous prime is 217226173238593. The next prime is 217226173238621. The reversal of 217226173238609 is 906832371622712.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 204041140784209 + 13185032454400 = 14284297^2 + 3631120^2 .

It is a cyclic number.

It is not a de Polignac number, because 217226173238609 - 2⁴ = 217226173238593 is a prime.

It is not a weakly prime, because it can be changed into another prime (217226173238689) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108613086619304 + 108613086619305.

It is an arithmetic number, because the mean of its divisors is an integer number (108613086619305).

Almost surely, 2^{217226173238609} is an apocalyptic number.

It is an amenable number.

217226173238609 is a deficient number, since it is larger than the sum of its proper divisors (1).

217226173238609 is an equidigital number, since it uses as much as digits as its factorization.

217226173238609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18289152, while the sum is 59.

The spelling of 217226173238609 in words is "two hundred seventeen trillion, two hundred twenty-six billion, one hundred seventy-three million, two hundred thirty-eight thousand, six hundred nine".