990109911 has 32 divisors (see below), whose sum is σ = 1580802048. Its totient is φ = 538956000.

The previous prime is 990109891. The next prime is 990109933. The reversal of 990109911 is 119901099.

It is not a de Polignac number, because 990109911 - 2¹⁰ = 990108887 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 990109911.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (990109511) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 117150 + ... + 125316.

It is an arithmetic number, because the mean of its divisors is an integer number (49400064).

Almost surely, 2^990109911 is an apocalyptic number.

990109911 is a deficient number, since it is larger than the sum of its proper divisors (590692137).

990109911 is a wasteful number, since it uses less digits than its factorization.

990109911 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8451.

The product of its (nonzero) digits is 6561, while the sum is 39.

The square root of 990109911 is about 31466.0119970739. The cubic root of 990109911 is about 996.6923753481.

The spelling of 990109911 in words is "nine hundred ninety million, one hundred nine thousand, nine hundred eleven".