9708991 has 2 divisors, whose sum is σ = 9708992. Its totient is φ = 9708990.

The previous prime is 9708977. The next prime is 9709003. The reversal of 9708991 is 1998079.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9708991 is a prime.

It is a nialpdrome in base 15.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9708901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4854495 + 4854496.

It is an arithmetic number, because the mean of its divisors is an integer number (4854496).

Almost surely, 2^9708991 is an apocalyptic number.

9708991 is a deficient number, since it is larger than the sum of its proper divisors (1).

9708991 is an equidigital number, since it uses as much as digits as its factorization.

9708991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 40824, while the sum is 43.

The square root of 9708991 is about 3115.9253842157. The cubic root of 9708991 is about 213.3329961475.

The spelling of 9708991 in words is "nine million, seven hundred eight thousand, nine hundred ninety-one".