109909 has 4 divisors (see below), whose sum is σ = 110880. Its totient is φ = 108940.

The previous prime is 109903. The next prime is 109913. The reversal of 109909 is 909901.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 109909 - 2⁹ = 109397 is a prime.

It is a Duffinian number.

109909 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (109903) 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, 289 + ... + 550.

It is an arithmetic number, because the mean of its divisors is an integer number (27720).

2¹⁰⁹⁹⁰⁹ is an apocalyptic number.

It is an amenable number.

109909 is a deficient number, since it is larger than the sum of its proper divisors (971).

109909 is an equidigital number, since it uses as much as digits as its factorization.

109909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 970.

The product of its (nonzero) digits is 729, while the sum is 28.

The square root of 109909 is about 331.5252629891. The cubic root of 109909 is about 47.9009822222.

The spelling of 109909 in words is "one hundred nine thousand, nine hundred nine".