9989191 has 2 divisors, whose sum is σ = 9989192. Its totient is φ = 9989190.

The previous prime is 9989179. The next prime is 9989197. The reversal of 9989191 is 1919899.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 9989191 - 2⁵ = 9989159 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9989197) 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, 4994595 + 4994596.

It is an arithmetic number, because the mean of its divisors is an integer number (4994596).

Almost surely, 2^9989191 is an apocalyptic number.

9989191 is a deficient number, since it is larger than the sum of its proper divisors (1).

9989191 is an equidigital number, since it uses as much as digits as its factorization.

9989191 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 52488, while the sum is 46.

The square root of 9989191 is about 3160.5681451283. The cubic root of 9989191 is about 215.3658167365.

The spelling of 9989191 in words is "nine million, nine hundred eighty-nine thousand, one hundred ninety-one".