111989911 has 8 divisors (see below), whose sum is σ = 123381648. Its totient is φ = 100800000.

The previous prime is 111989879. The next prime is 111989929. The reversal of 111989911 is 119989111.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 111989911 - 2⁵ = 111989879 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111989951) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 49290 + ... + 51511.

It is an arithmetic number, because the mean of its divisors is an integer number (15422706).

Almost surely, 2^111989911 is an apocalyptic number.

111989911 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

111989911 is a deficient number, since it is larger than the sum of its proper divisors (11391737).

111989911 is a wasteful number, since it uses less digits than its factorization.

111989911 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100913.

The product of its digits is 5832, while the sum is 40.

The square root of 111989911 is about 10582.5285730774. The cubic root of 111989911 is about 482.0139786354.

The spelling of 111989911 in words is "one hundred eleven million, nine hundred eighty-nine thousand, nine hundred eleven".