111111988 has 48 divisors (see below), whose sum is σ = 222235776. Its totient is φ = 48216960.

The previous prime is 111111953. The next prime is 111111989. The reversal of 111111988 is 889111111.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111111989) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 72195 + ... + 73717.

It is an arithmetic number, because the mean of its divisors is an integer number (4629912).

Almost surely, 2^111111988 is an apocalyptic number.

It is an amenable number.

111111988 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

111111988 is a wasteful number, since it uses less digits than its factorization.

111111988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1624 (or 1622 counting only the distinct ones).

The product of its digits is 576, while the sum is 31.

The square root of 111111988 is about 10540.9671283047. The cubic root of 111111988 is about 480.7511214584.

The spelling of 111111988 in words is "one hundred eleven million, one hundred eleven thousand, nine hundred eighty-eight".