135120520 has 16 divisors (see below), whose sum is σ = 304021260. Its totient is φ = 54048192.

The previous prime is 135120509. The next prime is 135120529. The reversal of 135120520 is 25021531.

It can be written as a sum of positive squares in 2 ways, for example, as 109537156 + 25583364 = 10466^2 + 5058^2 .

It is not an unprimeable number, because it can be changed into a prime (135120529) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1688967 + ... + 1689046.

Almost surely, 2^135120520 is an apocalyptic number.

135120520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

135120520 is an abundant number, since it is smaller than the sum of its proper divisors (168900740).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

135120520 is a wasteful number, since it uses less digits than its factorization.

135120520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3378024 (or 3378020 counting only the distinct ones).

The product of its (nonzero) digits is 300, while the sum is 19.

The square root of 135120520 is about 11624.1352366531. The cubic root of 135120520 is about 513.1453951173.

The spelling of 135120520 in words is "one hundred thirty-five million, one hundred twenty thousand, five hundred twenty".