9798327331981 has 2 divisors, whose sum is σ = 9798327331982. Its totient is φ = 9798327331980.

The previous prime is 9798327331967. The next prime is 9798327331987. The reversal of 9798327331981 is 1891337238979.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9607241198025 + 191086133956 = 3099555^2 + 437134^2 .

It is a cyclic number.

It is not a de Polignac number, because 9798327331981 - 2²⁵ = 9798293777549 is a prime.

It is a super-2 number, since 2×9798327331981² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 9798327331981.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9798327331987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4899163665990 + 4899163665991.

It is an arithmetic number, because the mean of its divisors is an integer number (4899163665991).

Almost surely, 2^{9798327331981} is an apocalyptic number.

It is an amenable number.

9798327331981 is a deficient number, since it is larger than the sum of its proper divisors (1).

9798327331981 is an equidigital number, since it uses as much as digits as its factorization.

9798327331981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 123451776, while the sum is 70.

The spelling of 9798327331981 in words is "nine trillion, seven hundred ninety-eight billion, three hundred twenty-seven million, three hundred thirty-one thousand, nine hundred eighty-one".