111109993 has 4 divisors (see below), whose sum is σ = 111146308. Its totient is φ = 111073680.

The previous prime is 111109981. The next prime is 111109997. The reversal of 111109993 is 399901111.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 399901111 = 983 ⋅406817.

It can be written as a sum of positive squares in 2 ways, for example, as 105925264 + 5184729 = 10292^2 + 2277^2 .

It is a cyclic number.

It is not a de Polignac number, because 111109993 - 2⁵ = 111109961 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (111109997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13098 + ... + 19843.

It is an arithmetic number, because the mean of its divisors is an integer number (27786577).

Almost surely, 2^111109993 is an apocalyptic number.

It is an amenable number.

111109993 is a deficient number, since it is larger than the sum of its proper divisors (36315).

111109993 is an equidigital number, since it uses as much as digits as its factorization.

111109993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36314.

The product of its (nonzero) digits is 2187, while the sum is 34.

The square root of 111109993 is about 10540.8724970943. The cubic root of 111109993 is about 480.7482441685.

The spelling of 111109993 in words is "one hundred eleven million, one hundred nine thousand, nine hundred ninety-three".