9909999100 has 36 divisors (see below), whose sum is σ = 22636528600. Its totient is φ = 3755367360.

The previous prime is 9909999067. The next prime is 9909999109. The reversal of 9909999100 is 19999099.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9909999109) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2605995 + ... + 2609794.

Almost surely, 2^9909999100 is an apocalyptic number.

It is an amenable number.

9909999100 is an abundant number, since it is smaller than the sum of its proper divisors (12726529500).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

9909999100 is a wasteful number, since it uses less digits than its factorization.

9909999100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5215822 (or 5215815 counting only the distinct ones).

The product of its (nonzero) digits is 531441, while the sum is 55.

The square root of 9909999100 is about 99548.9783975707. The cubic root of 9909999100 is about 2147.9518334907.

The spelling of 9909999100 in words is "nine billion, nine hundred nine million, nine hundred ninety-nine thousand, one hundred".