135205709 has 8 divisors (see below), whose sum is σ = 145121400. Its totient is φ = 125508096.

The previous prime is 135205687. The next prime is 135205739. The reversal of 135205709 is 907502531.

It can be written as a sum of positive squares in 4 ways, for example, as 88924900 + 46280809 = 9430^2 + 6803^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-135205709 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135205739) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 53234 + ... + 55715.

It is an arithmetic number, because the mean of its divisors is an integer number (18140175).

Almost surely, 2^135205709 is an apocalyptic number.

It is an amenable number.

135205709 is a deficient number, since it is larger than the sum of its proper divisors (9915691).

135205709 is a wasteful number, since it uses less digits than its factorization.

135205709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109039.

The product of its (nonzero) digits is 9450, while the sum is 32.

The square root of 135205709 is about 11627.7989748705. The cubic root of 135205709 is about 513.2532128380.

The spelling of 135205709 in words is "one hundred thirty-five million, two hundred five thousand, seven hundred nine".