111981966 has 8 divisors (see below), whose sum is σ = 223963944. Its totient is φ = 37327320.

The previous prime is 111981949. The next prime is 111981973. The reversal of 111981966 is 669189111.

It is a happy number.

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

111981966 is an admirable number.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9331825 + ... + 9331836.

It is an arithmetic number, because the mean of its divisors is an integer number (27995493).

Almost surely, 2^111981966 is an apocalyptic number.

111981966 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

111981966 is a wasteful number, since it uses less digits than its factorization.

111981966 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18663666.

The product of its digits is 23328, while the sum is 42.

The square root of 111981966 is about 10582.1531835445. The cubic root of 111981966 is about 482.0025797168.

The spelling of 111981966 in words is "one hundred eleven million, nine hundred eighty-one thousand, nine hundred sixty-six".