991199122 has 16 divisors (see below), whose sum is σ = 1552272192. Its totient is φ = 473798160.

The previous prime is 991199117. The next prime is 991199123. The reversal of 991199122 is 221991199.

It is not an unprimeable number, because it can be changed into a prime (991199123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 103372 + ... + 112552.

It is an arithmetic number, because the mean of its divisors is an integer number (97017012).

Almost surely, 2^991199122 is an apocalyptic number.

991199122 is a deficient number, since it is larger than the sum of its proper divisors (561073070).

991199122 is a wasteful number, since it uses less digits than its factorization.

991199122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11553.

The product of its digits is 26244, while the sum is 43.

The square root of 991199122 is about 31483.3149779371. The cubic root of 991199122 is about 997.0577255112.

It can be divided in two parts, 99119 and 9122, that added together give a square (108241 = 329²).

The spelling of 991199122 in words is "nine hundred ninety-one million, one hundred ninety-nine thousand, one hundred twenty-two".