1100109991 has 4 divisors (see below), whose sum is σ = 1126941984. Its totient is φ = 1073278000.

The previous prime is 1100109961. The next prime is 1100110007. The reversal of 1100109991 is 1999010011.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1100109991 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1100109911) 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 3 ways as a sum of consecutive naturals, for example, 13415935 + ... + 13416016.

It is an arithmetic number, because the mean of its divisors is an integer number (281735496).

Almost surely, 2^1100109991 is an apocalyptic number.

1100109991 is a deficient number, since it is larger than the sum of its proper divisors (26831993).

1100109991 is an equidigital number, since it uses as much as digits as its factorization.

1100109991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26831992.

The product of its (nonzero) digits is 729, while the sum is 31.

The square root of 1100109991 is about 33167.9060388201. The cubic root of 1100109991 is about 1032.3145208315.

The spelling of 1100109991 in words is "one billion, one hundred million, one hundred nine thousand, nine hundred ninety-one".