9991183 has 2 divisors, whose sum is σ = 9991184. Its totient is φ = 9991182.

The previous prime is 9991159. The next prime is 9991187. The reversal of 9991183 is 3811999.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 9991183 - 2⁵ = 9991151 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9991187) 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, 4995591 + 4995592.

It is an arithmetic number, because the mean of its divisors is an integer number (4995592).

Almost surely, 2^9991183 is an apocalyptic number.

9991183 is a deficient number, since it is larger than the sum of its proper divisors (1).

9991183 is an equidigital number, since it uses as much as digits as its factorization.

9991183 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17496, while the sum is 40.

The square root of 9991183 is about 3160.8832626340. The cubic root of 9991183 is about 215.3801315491.

The spelling of 9991183 in words is "nine million, nine hundred ninety-one thousand, one hundred eighty-three".