17989347217 has 2 divisors, whose sum is σ = 17989347218. Its totient is φ = 17989347216.

The previous prime is 17989347203. The next prime is 17989347221. The reversal of 17989347217 is 71274398971.

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., 14408641296 + 3580705921 = 120036^2 + 59839^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-17989347217 is a prime.

It is a super-2 number, since 2×17989347217² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (17989347227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8994673608 + 8994673609.

It is an arithmetic number, because the mean of its divisors is an integer number (8994673609).

Almost surely, 2^17989347217 is an apocalyptic number.

It is an amenable number.

17989347217 is a deficient number, since it is larger than the sum of its proper divisors (1).

17989347217 is an equidigital number, since it uses as much as digits as its factorization.

17989347217 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5334336, while the sum is 58.

The spelling of 17989347217 in words is "seventeen billion, nine hundred eighty-nine million, three hundred forty-seven thousand, two hundred seventeen".