11099991 has 16 divisors (see below), whose sum is σ = 17107200. Its totient is φ = 6270528.

The previous prime is 11099983. The next prime is 11099993. The reversal of 11099991 is 19999011.

It is not a de Polignac number, because 11099991 - 2³ = 11099983 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11099993) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1101 + ... + 4838.

It is an arithmetic number, because the mean of its divisors is an integer number (1069200).

Almost surely, 2^11099991 is an apocalyptic number.

11099991 is a deficient number, since it is larger than the sum of its proper divisors (6007209).

11099991 is an equidigital number, since it uses as much as digits as its factorization.

11099991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6038.

The product of its (nonzero) digits is 6561, while the sum is 39.

The square root of 11099991 is about 3331.6648991158. The cubic root of 11099991 is about 223.0698501584.

It can be divided in two parts, 11099 and 991, that added together give a triangular number (12090 = T₁₅₅).

The spelling of 11099991 in words is "eleven million, ninety-nine thousand, nine hundred ninety-one".