9995891 has 2 divisors, whose sum is σ = 9995892. Its totient is φ = 9995890.

The previous prime is 9995861. The next prime is 9995903. The reversal of 9995891 is 1985999.

9995891 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 9995891 - 2⁶ = 9995827 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (9995801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4997945 + 4997946.

It is an arithmetic number, because the mean of its divisors is an integer number (4997946).

Almost surely, 2^9995891 is an apocalyptic number.

9995891 is a deficient number, since it is larger than the sum of its proper divisors (1).

9995891 is an equidigital number, since it uses as much as digits as its factorization.

9995891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 262440, while the sum is 50.

The square root of 9995891 is about 3161.6279034700. The cubic root of 9995891 is about 215.4139563868.

The spelling of 9995891 in words is "nine million, nine hundred ninety-five thousand, eight hundred ninety-one".