109911991100 has 72 divisors (see below), whose sum is σ = 246296486016. Its totient is φ = 42530400000.

The previous prime is 109911991067. The next prime is 109911991127. The reversal of 109911991100 is 1199119901.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11096150 + ... + 11106050.

It is an arithmetic number, because the mean of its divisors is an integer number (3420784528).

Almost surely, 2^109911991100 is an apocalyptic number.

109911991100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 109911991100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (123148243008).

109911991100 is an abundant number, since it is smaller than the sum of its proper divisors (136384494916).

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

109911991100 is a wasteful number, since it uses less digits than its factorization.

109911991100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13527 (or 13520 counting only the distinct ones).

The product of its (nonzero) digits is 6561, while the sum is 41.

It can be divided in two parts, 109911 and 991100, that added together give a palindrome (1101011).

The spelling of 109911991100 in words is "one hundred nine billion, nine hundred eleven million, nine hundred ninety-one thousand, one hundred".