135000209 has 4 divisors (see below), whose sum is σ = 135023616. Its totient is φ = 134976804.

The previous prime is 135000199. The next prime is 135000233. The reversal of 135000209 is 902000531.

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 135000209 - 2⁴ = 135000193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (135000709) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3752 + ... + 16854.

It is an arithmetic number, because the mean of its divisors is an integer number (33755904).

Almost surely, 2^135000209 is an apocalyptic number.

It is an amenable number.

135000209 is a deficient number, since it is larger than the sum of its proper divisors (23407).

135000209 is a wasteful number, since it uses less digits than its factorization.

135000209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23406.

The product of its (nonzero) digits is 270, while the sum is 20.

The square root of 135000209 is about 11618.9590325468. The cubic root of 135000209 is about 512.9930487325.

The spelling of 135000209 in words is "one hundred thirty-five million, two hundred nine", and thus it is an aban number.