135520559 has 4 divisors (see below), whose sum is σ = 142653240. Its totient is φ = 128387880.

The previous prime is 135520519. The next prime is 135520571. The reversal of 135520559 is 955025531.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-135520559 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 (135520519) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3566312 + ... + 3566349.

It is an arithmetic number, because the mean of its divisors is an integer number (35663310).

Almost surely, 2^135520559 is an apocalyptic number.

135520559 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

135520559 is a deficient number, since it is larger than the sum of its proper divisors (7132681).

135520559 is an equidigital number, since it uses as much as digits as its factorization.

135520559 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7132680.

The product of its (nonzero) digits is 33750, while the sum is 35.

The square root of 135520559 is about 11641.3297779936. The cubic root of 135520559 is about 513.6513037695.

The spelling of 135520559 in words is "one hundred thirty-five million, five hundred twenty thousand, five hundred fifty-nine".