109205 has 4 divisors (see below), whose sum is σ = 131052. Its totient is φ = 87360.

The previous prime is 109201. The next prime is 109211. The reversal of 109205 is 502901.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 502901 = 7 ⋅71843.

It can be written as a sum of positive squares in 2 ways, for example, as 11236 + 97969 = 106^2 + 313^2 .

It is not a de Polignac number, because 109205 - 2² = 109201 is a prime.

It is a Duffinian number.

It is a plaindrome in base 15.

It is a zygodrome in base 15.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 109205.

It is not an unprimeable number, because it can be changed into a prime (109201) 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, 10916 + ... + 10925.

It is an arithmetic number, because the mean of its divisors is an integer number (32763).

2¹⁰⁹²⁰⁵ is an apocalyptic number.

It is an amenable number.

109205 is a deficient number, since it is larger than the sum of its proper divisors (21847).

109205 is an equidigital number, since it uses as much as digits as its factorization.

109205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21846.

The product of its (nonzero) digits is 90, while the sum is 17.

The square root of 109205 is about 330.4617980947. The cubic root of 109205 is about 47.7984897079.

The spelling of 109205 in words is "one hundred nine thousand, two hundred five".