11099891 has 16 divisors (see below), whose sum is σ = 12807168. Its totient is φ = 9525600.

The previous prime is 11099873. The next prime is 11099897. The reversal of 11099891 is 19899011.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11099891 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11099897) 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, 14285 + ... + 15041.

It is an arithmetic number, because the mean of its divisors is an integer number (800448).

Almost surely, 2^11099891 is an apocalyptic number.

11099891 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

11099891 is a deficient number, since it is larger than the sum of its proper divisors (1707277).

11099891 is a wasteful number, since it uses less digits than its factorization.

11099891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 842.

The product of its (nonzero) digits is 5832, while the sum is 38.

The square root of 11099891 is about 3331.6498915702. The cubic root of 11099891 is about 223.0691802764.

It can be divided in two parts, 110 and 99891, that added together give a palindrome (100001).

The spelling of 11099891 in words is "eleven million, ninety-nine thousand, eight hundred ninety-one".