111115990 has 64 divisors (see below), whose sum is σ = 224778240. Its totient is φ = 39346560.

The previous prime is 111115987. The next prime is 111116011. The reversal of 111115990 is 99511111.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 205120 + ... + 205660.

It is an arithmetic number, because the mean of its divisors is an integer number (3512160).

Almost surely, 2^111115990 is an apocalyptic number.

111115990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

111115990 is an abundant number, since it is smaller than the sum of its proper divisors (113662250).

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

111115990 is a wasteful number, since it uses less digits than its factorization.

111115990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 637.

The product of its (nonzero) digits is 405, while the sum is 28.

The square root of 111115990 is about 10541.1569573743. The cubic root of 111115990 is about 480.7568932416.

The spelling of 111115990 in words is "one hundred eleven million, one hundred fifteen thousand, nine hundred ninety".