9911099111 has 4 divisors (see below), whose sum is σ = 10141589832. Its totient is φ = 9680608392.

The previous prime is 9911099101. The next prime is 9911099123. The reversal of 9911099111 is 1119901199.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1119901199 = 12941 ⋅86539.

It is a cyclic number.

It is not a de Polignac number, because 9911099111 - 2⁶ = 9911099047 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 (9911099101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 115245296 + ... + 115245381.

It is an arithmetic number, because the mean of its divisors is an integer number (2535397458).

Almost surely, 2^9911099111 is an apocalyptic number.

9911099111 is a deficient number, since it is larger than the sum of its proper divisors (230490721).

9911099111 is a wasteful number, since it uses less digits than its factorization.

9911099111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 230490720.

The product of its (nonzero) digits is 6561, while the sum is 41.

The square root of 9911099111 is about 99554.5032180865. The cubic root of 9911099111 is about 2148.0313048476.

It can be divided in two parts, 99110991 and 11, that multiplied together give a palindrome (1090220901).

The spelling of 9911099111 in words is "nine billion, nine hundred eleven million, ninety-nine thousand, one hundred eleven".