111991368 has 32 divisors (see below), whose sum is σ = 280792800. Its totient is φ = 37221888.

The previous prime is 111991367. The next prime is 111991379. The reversal of 111991368 is 863199111.

It is a super-2 number, since 2×111991368² = 25084133013022848, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (111991361) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1863 + ... + 15081.

It is an arithmetic number, because the mean of its divisors is an integer number (8774775).

Almost surely, 2^111991368 is an apocalyptic number.

It is an amenable number.

111991368 is an abundant number, since it is smaller than the sum of its proper divisors (168801432).

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

111991368 is a wasteful number, since it uses less digits than its factorization.

111991368 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13581 (or 13577 counting only the distinct ones).

The product of its digits is 11664, while the sum is 39.

The square root of 111991368 is about 10582.5974127338. The cubic root of 111991368 is about 482.0160689764.

The spelling of 111991368 in words is "one hundred eleven million, nine hundred ninety-one thousand, three hundred sixty-eight".