111109985 has 8 divisors (see below), whose sum is σ = 152379456. Its totient is φ = 76189680.

The previous prime is 111109981. The next prime is 111109997. The reversal of 111109985 is 589901111.

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

It is not a de Polignac number, because 111109985 - 2² = 111109981 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (35), and also a Moran number because the ratio is a prime number: 3174571 = 111109985 / (1 + 1 + 1 + 1 + 0 + 9 + 9 + 8 + 5).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (111109981) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1587251 + ... + 1587320.

It is an arithmetic number, because the mean of its divisors is an integer number (19047432).

Almost surely, 2^111109985 is an apocalyptic number.

It is an amenable number.

111109985 is a deficient number, since it is larger than the sum of its proper divisors (41269471).

111109985 is an equidigital number, since it uses as much as digits as its factorization.

111109985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3174583.

The product of its (nonzero) digits is 3240, while the sum is 35.

The square root of 111109985 is about 10540.8721176191. The cubic root of 111109985 is about 480.7482326304.

The spelling of 111109985 in words is "one hundred eleven million, one hundred nine thousand, nine hundred eighty-five".