108909 has 6 divisors (see below), whose sum is σ = 157326. Its totient is φ = 72600.

The previous prime is 108907. The next prime is 108917. The reversal of 108909 is 909801.

It can be written as a sum of positive squares in only one way, i.e., 108900 + 9 = 330^2 + 3^2 .

It is not a de Polignac number, because 108909 - 2¹ = 108907 is a prime.

It is a super-2 number, since 2×108909² = 23722340562, which contains 22 as substring.

108909 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (108907) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6042 + ... + 6059.

It is an arithmetic number, because the mean of its divisors is an integer number (26221).

2¹⁰⁸⁹⁰⁹ is an apocalyptic number.

It is an amenable number.

108909 is a deficient number, since it is larger than the sum of its proper divisors (48417).

108909 is a wasteful number, since it uses less digits than its factorization.

108909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12107 (or 12104 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 27.

The square root of 108909 is about 330.0136360819. The cubic root of 108909 is about 47.7552647174.

The spelling of 108909 in words is "one hundred eight thousand, nine hundred nine".