11991199 has 16 divisors (see below), whose sum is σ = 13479840. Its totient is φ = 10575360.

The previous prime is 11991167. The next prime is 11991209. The reversal of 11991199 is 99119911.

It is a cyclic number.

It is not a de Polignac number, because 11991199 - 2⁵ = 11991167 is a prime.

It is a zygodrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11991139) by changing a digit.

It is an upside-down number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 87459 + ... + 87595.

It is an arithmetic number, because the mean of its divisors is an integer number (842490).

Almost surely, 2^11991199 is an apocalyptic number.

11991199 is a deficient number, since it is larger than the sum of its proper divisors (1488641).

11991199 is a wasteful number, since it uses less digits than its factorization.

11991199 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 330.

The product of its digits is 6561, while the sum is 40.

The square root of 11991199 is about 3462.8310672050. The cubic root of 11991199 is about 228.8868646550.

The spelling of 11991199 in words is "eleven million, nine hundred ninety-one thousand, one hundred ninety-nine".