111981600 has 216 divisors, whose sum is σ = 401349312. Its totient is φ = 29376000.

The previous prime is 111981577. The next prime is 111981613. The reversal of 111981600 is 6189111.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 741525 + ... + 741675.

Almost surely, 2^111981600 is an apocalyptic number.

111981600 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 111981600, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (200674656).

111981600 is an abundant number, since it is smaller than the sum of its proper divisors (289367712).

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

111981600 is a wasteful number, since it uses less digits than its factorization.

111981600 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 280 (or 264 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 27.

The square root of 111981600 is about 10582.1358902634. The cubic root of 111981600 is about 482.0020545931.

The spelling of 111981600 in words is "one hundred eleven million, nine hundred eighty-one thousand, six hundred".