9981092321 has 2 divisors, whose sum is σ = 9981092322. Its totient is φ = 9981092320.

The previous prime is 9981092281. The next prime is 9981092333. The reversal of 9981092321 is 1232901899.

It is a happy number.

9981092321 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9165190225 + 815902096 = 95735^2 + 28564^2 .

It is a cyclic number.

It is not a de Polignac number, because 9981092321 - 2¹⁸ = 9980830177 is a prime.

It is not a weakly prime, because it can be changed into another prime (9981092021) 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, 4990546160 + 4990546161.

It is an arithmetic number, because the mean of its divisors is an integer number (4990546161).

Almost surely, 2^9981092321 is an apocalyptic number.

It is an amenable number.

9981092321 is a deficient number, since it is larger than the sum of its proper divisors (1).

9981092321 is an equidigital number, since it uses as much as digits as its factorization.

9981092321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 69984, while the sum is 44.

The square root of 9981092321 is about 99905.4168751625. The cubic root of 9981092321 is about 2153.0759880235.

The spelling of 9981092321 in words is "nine billion, nine hundred eighty-one million, ninety-two thousand, three hundred twenty-one".