9923791 has 2 divisors, whose sum is σ = 9923792. Its totient is φ = 9923790.

The previous prime is 9923789. The next prime is 9923803. The reversal of 9923791 is 1973299.

9923791 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is an emirp because it is prime and its reverse (1973299) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9923791 - 2¹ = 9923789 is a prime.

Together with 9923789, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9923701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4961895 + 4961896.

It is an arithmetic number, because the mean of its divisors is an integer number (4961896).

Almost surely, 2^9923791 is an apocalyptic number.

9923791 is a deficient number, since it is larger than the sum of its proper divisors (1).

9923791 is an equidigital number, since it uses as much as digits as its factorization.

9923791 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 30618, while the sum is 40.

The square root of 9923791 is about 3150.2049139699. The cubic root of 9923791 is about 214.8947817591.

The spelling of 9923791 in words is "nine million, nine hundred twenty-three thousand, seven hundred ninety-one".