991122 has 16 divisors (see below), whose sum is σ = 2162592. Its totient is φ = 300320.

The previous prime is 991091. The next prime is 991127. The reversal of 991122 is 221199.

It is a zygodrome in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 991092 and 991101.

It is not an unprimeable number, because it can be changed into a prime (991127) by changing a digit.

991122 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7443 + ... + 7574.

It is an arithmetic number, because the mean of its divisors is an integer number (135162).

2⁹⁹¹¹²² is an apocalyptic number.

991122 is an abundant number, since it is smaller than the sum of its proper divisors (1171470).

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

991122 is a wasteful number, since it uses less digits than its factorization.

991122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15033.

The product of its digits is 324, while the sum is 24.

The square root of 991122 is about 995.5511036607. The cubic root of 991122 is about 99.7031865561.

It can be divided in two parts, 99 and 1122, that added together give a palindrome (1221).

The spelling of 991122 in words is "nine hundred ninety-one thousand, one hundred twenty-two".