111991067 has 4 divisors (see below), whose sum is σ = 114104160. Its totient is φ = 109877976.

The previous prime is 111991063. The next prime is 111991081. The reversal of 111991067 is 760199111.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 111991067 - 2² = 111991063 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (111991063) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1056467 + ... + 1056572.

It is an arithmetic number, because the mean of its divisors is an integer number (28526040).

Almost surely, 2^111991067 is an apocalyptic number.

111991067 is a deficient number, since it is larger than the sum of its proper divisors (2113093).

111991067 is an equidigital number, since it uses as much as digits as its factorization.

111991067 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2113092.

The product of its (nonzero) digits is 3402, while the sum is 35.

The square root of 111991067 is about 10582.5831912629. The cubic root of 111991067 is about 482.0156371367.

The spelling of 111991067 in words is "one hundred eleven million, nine hundred ninety-one thousand, sixty-seven".