11991099 has 8 divisors (see below), whose sum is σ = 16007680. Its totient is φ = 7984296.

The previous prime is 11991097. The next prime is 11991107. The reversal of 11991099 is 99019911.

11991099 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 11991099 - 2¹ = 11991097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11991097) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1194 + ... + 5040.

It is an arithmetic number, because the mean of its divisors is an integer number (2000960).

Almost surely, 2^11991099 is an apocalyptic number.

11991099 is a deficient number, since it is larger than the sum of its proper divisors (4016581).

11991099 is a wasteful number, since it uses less digits than its factorization.

11991099 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4889.

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

The square root of 11991099 is about 3462.8166281223. The cubic root of 11991099 is about 228.8862283897.

The spelling of 11991099 in words is "eleven million, nine hundred ninety-one thousand, ninety-nine".