9909999099 has 96 divisors (see below), whose sum is σ = 19380361728. Its totient is φ = 4751524800.

The previous prime is 9909999067. The next prime is 9909999109.

9909999099 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 9909999099 - 2⁵ = 9909999067 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9909999019) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1085544 + ... + 1094634.

It is an arithmetic number, because the mean of its divisors is an integer number (201878768).

Almost surely, 2^9909999099 is an apocalyptic number.

9909999099 is a gapful number since it is divisible by the number (99) formed by its first and last digit.

9909999099 is a deficient number, since it is larger than the sum of its proper divisors (9470362629).

9909999099 is a wasteful number, since it uses less digits than its factorization.

9909999099 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9150 (or 9125 counting only the distinct ones).

The product of its (nonzero) digits is 43046721, while the sum is 72.

The square root of 9909999099 is about 99548.9783925481. The cubic root of 9909999099 is about 2147.9518334184.

The spelling of 9909999099 in words is "nine billion, nine hundred nine million, nine hundred ninety-nine thousand, ninety-nine".