10991199109 has 8 divisors (see below), whose sum is σ = 12102460128. Its totient is φ = 9898614960.

The previous prime is 10991199103. The next prime is 10991199119. The reversal of 10991199109 is 90199119901.

It is a happy number.

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 10991199109 - 2⁵ = 10991199077 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10991199103) 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, 4667982 + ... + 4670335.

It is an arithmetic number, because the mean of its divisors is an integer number (1512807516).

Almost surely, 2^10991199109 is an apocalyptic number.

It is an amenable number.

10991199109 is a deficient number, since it is larger than the sum of its proper divisors (1111261019).

10991199109 is a wasteful number, since it uses less digits than its factorization.

10991199109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9338435.

The product of its (nonzero) digits is 59049, while the sum is 49.

The spelling of 10991199109 in words is "ten billion, nine hundred ninety-one million, one hundred ninety-nine thousand, one hundred nine".