9991111222 has 16 divisors (see below), whose sum is σ = 15276381120. Its totient is φ = 4899850632.

The previous prime is 9991111187. The next prime is 9991111223. The reversal of 9991111222 is 2221111999.

9991111222 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is a zygodrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9991111223) 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 in 7 ways as a sum of consecutive naturals, for example, 193428 + ... + 239575.

It is an arithmetic number, because the mean of its divisors is an integer number (954773820).

Almost surely, 2^9991111222 is an apocalyptic number.

9991111222 is a deficient number, since it is larger than the sum of its proper divisors (5285269898).

9991111222 is a wasteful number, since it uses less digits than its factorization.

9991111222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 433227.

The product of its digits is 5832, while the sum is 37.

The square root of 9991111222 is about 99955.5462293114. The cubic root of 9991111222 is about 2153.7961577463.

The spelling of 9991111222 in words is "nine billion, nine hundred ninety-one million, one hundred eleven thousand, two hundred twenty-two".