10991199 has 8 divisors (see below), whose sum is σ = 14677632. Its totient is φ = 7316120.

The previous prime is 10991173. The next prime is 10991207. The reversal of 10991199 is 99119901.

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

It is a cyclic number.

It is not a de Polignac number, because 10991199 - 2¹¹ = 10989151 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10991159) 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, 237 + ... + 4694.

It is an arithmetic number, because the mean of its divisors is an integer number (1834704).

Almost surely, 2^10991199 is an apocalyptic number.

10991199 is a deficient number, since it is larger than the sum of its proper divisors (3686433).

10991199 is an equidigital number, since it uses as much as digits as its factorization.

10991199 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5677.

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

The square root of 10991199 is about 3315.2977241871. The cubic root of 10991199 is about 222.3386803563.

The spelling of 10991199 in words is "ten million, nine hundred ninety-one thousand, one hundred ninety-nine".