990999999100 has 18 divisors (see below), whose sum is σ = 2150469998264. Its totient is φ = 396399999600.

The previous prime is 990999999097. The next prime is 990999999103. The reversal of 990999999100 is 1999999099.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (990999999097) and next prime (990999999103).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (990999999103) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4954999896 + ... + 4955000095.

Almost surely, 2^990999999100 is an apocalyptic number.

It is an amenable number.

990999999100 is an abundant number, since it is smaller than the sum of its proper divisors (1159469999164).

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

990999999100 is a wasteful number, since it uses less digits than its factorization.

990999999100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9910000005 (or 9909999998 counting only the distinct ones).

The product of its (nonzero) digits is 43046721, while the sum is 73.

The spelling of 990999999100 in words is "nine hundred ninety billion, nine hundred ninety-nine million, nine hundred ninety-nine thousand, one hundred".