9991099011 has 8 divisors (see below), whose sum is σ = 13681505104. Its totient is φ = 6480712800.

The previous prime is 9991099009. The next prime is 9991099039. The reversal of 9991099011 is 1109901999.

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

It is not a de Polignac number, because 9991099011 - 2¹ = 9991099009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9991099051) 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, 45004840 + ... + 45005061.

It is an arithmetic number, because the mean of its divisors is an integer number (1710188138).

Almost surely, 2^9991099011 is an apocalyptic number.

9991099011 is a deficient number, since it is larger than the sum of its proper divisors (3690406093).

9991099011 is a wasteful number, since it uses less digits than its factorization.

9991099011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90009941.

The product of its (nonzero) digits is 59049, while the sum is 48.

The square root of 9991099011 is about 99955.4851471394. The cubic root of 9991099011 is about 2153.7952802991.

The spelling of 9991099011 in words is "nine billion, nine hundred ninety-one million, ninety-nine thousand, eleven".