135520509 has 8 divisors (see below), whose sum is σ = 186924960. Its totient is φ = 87231536.

The previous prime is 135520507. The next prime is 135520519. The reversal of 135520509 is 905025531.

135520509 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 135520509 - 2¹ = 135520507 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135520507) 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, 778767 + ... + 778940.

It is an arithmetic number, because the mean of its divisors is an integer number (23365620).

Almost surely, 2^135520509 is an apocalyptic number.

It is an amenable number.

135520509 is a deficient number, since it is larger than the sum of its proper divisors (51404451).

135520509 is a wasteful number, since it uses less digits than its factorization.

135520509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1557739.

The product of its (nonzero) digits is 6750, while the sum is 30.

The square root of 135520509 is about 11641.3276304724. The cubic root of 135520509 is about 513.6512405993.

The spelling of 135520509 in words is "one hundred thirty-five million, five hundred twenty thousand, five hundred nine".