109985 has 4 divisors (see below), whose sum is σ = 131988. Its totient is φ = 87984.

The previous prime is 109961. The next prime is 109987. The reversal of 109985 is 589901.

109985 is nontrivially palindromic in base 16.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 589901 = 13 ⋅45377.

It can be written as a sum of positive squares in 2 ways, for example, as 55696 + 54289 = 236^2 + 233^2 .

It is a cyclic number.

It is not a de Polignac number, because 109985 - 2¹⁰ = 108961 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (109987) 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, 10994 + ... + 11003.

It is an arithmetic number, because the mean of its divisors is an integer number (32997).

2¹⁰⁹⁹⁸⁵ is an apocalyptic number.

It is an amenable number.

109985 is a deficient number, since it is larger than the sum of its proper divisors (22003).

109985 is an equidigital number, since it uses as much as digits as its factorization.

109985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22002.

The product of its (nonzero) digits is 3240, while the sum is 32.

The square root of 109985 is about 331.6398649137. The cubic root of 109985 is about 47.9120205535.

The spelling of 109985 in words is "one hundred nine thousand, nine hundred eighty-five".