9991122 has 16 divisors (see below), whose sum is σ = 20181312. Its totient is φ = 3297200.

The previous prime is 9991067. The next prime is 9991123. The reversal of 9991122 is 2211999.

9991122 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

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 (9991123) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7638 + ... + 8849.

It is an arithmetic number, because the mean of its divisors is an integer number (1261332).

Almost surely, 2^9991122 is an apocalyptic number.

9991122 is an abundant number, since it is smaller than the sum of its proper divisors (10190190).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

9991122 is a wasteful number, since it uses less digits than its factorization.

9991122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16593.

The product of its digits is 2916, while the sum is 33.

The square root of 9991122 is about 3160.8736134177. The cubic root of 9991122 is about 215.3796932222.

The spelling of 9991122 in words is "nine million, nine hundred ninety-one thousand, one hundred twenty-two".