9991308917 has 2 divisors, whose sum is σ = 9991308918. Its totient is φ = 9991308916.

The previous prime is 9991308911. The next prime is 9991309001. The reversal of 9991308917 is 7198031999.

9991308917 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7834728196 + 2156580721 = 88514^2 + 46439^2 .

It is a cyclic number.

It is not a de Polignac number, because 9991308917 - 2⁸ = 9991308661 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9991308911) 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, 4995654458 + 4995654459.

It is an arithmetic number, because the mean of its divisors is an integer number (4995654459).

Almost surely, 2^9991308917 is an apocalyptic number.

It is an amenable number.

9991308917 is a deficient number, since it is larger than the sum of its proper divisors (1).

9991308917 is an equidigital number, since it uses as much as digits as its factorization.

9991308917 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1102248, while the sum is 56.

The square root of 9991308917 is about 99956.5351390293. The cubic root of 9991308917 is about 2153.8103634375.

The spelling of 9991308917 in words is "nine billion, nine hundred ninety-one million, three hundred eight thousand, nine hundred seventeen".