135909 has 6 divisors (see below), whose sum is σ = 196326. Its totient is φ = 90600.

The previous prime is 135899. The next prime is 135911. The reversal of 135909 is 909531.

It can be written as a sum of positive squares in only one way, i.e., 91809 + 44100 = 303^2 + 210^2 .

It is not a de Polignac number, because 135909 - 2⁴ = 135893 is a prime.

It is a plaindrome in base 12.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135929) 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, 7542 + ... + 7559.

It is an arithmetic number, because the mean of its divisors is an integer number (32721).

2¹³⁵⁹⁰⁹ is an apocalyptic number.

It is an amenable number.

135909 is a deficient number, since it is larger than the sum of its proper divisors (60417).

135909 is a wasteful number, since it uses less digits than its factorization.

135909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15107 (or 15104 counting only the distinct ones).

The product of its (nonzero) digits is 1215, while the sum is 27.

The square root of 135909 is about 368.6583784481. The cubic root of 135909 is about 51.4141593214.

The spelling of 135909 in words is "one hundred thirty-five thousand, nine hundred nine".