9841994217569 has 2 divisors, whose sum is σ = 9841994217570. Its totient is φ = 9841994217568.

The previous prime is 9841994217553. The next prime is 9841994217589. The reversal of 9841994217569 is 9657124991489.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6440109081169 + 3401885136400 = 2537737^2 + 1844420^2 .

It is a cyclic number.

It is not a de Polignac number, because 9841994217569 - 2⁴ = 9841994217553 is a prime.

It is a super-2 number, since 2×9841994217569² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 9841994217496 and 9841994217505.

It is not a weakly prime, because it can be changed into another prime (9841994217589) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4920997108784 + 4920997108785.

It is an arithmetic number, because the mean of its divisors is an integer number (4920997108785).

Almost surely, 2^{9841994217569} is an apocalyptic number.

It is an amenable number.

9841994217569 is a deficient number, since it is larger than the sum of its proper divisors (1).

9841994217569 is an equidigital number, since it uses as much as digits as its factorization.

9841994217569 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 352719360, while the sum is 74.

The spelling of 9841994217569 in words is "nine trillion, eight hundred forty-one billion, nine hundred ninety-four million, two hundred seventeen thousand, five hundred sixty-nine".