135538559 has 4 divisors (see below), whose sum is σ = 145964616. Its totient is φ = 125112504.

The previous prime is 135538499. The next prime is 135538567. The reversal of 135538559 is 955835531.

135538559 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 955835531 = 7 ⋅136547933.

It is a cyclic number.

It is not a de Polignac number, because 135538559 - 2¹² = 135534463 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 (135538859) 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, 5213009 + ... + 5213034.

It is an arithmetic number, because the mean of its divisors is an integer number (36491154).

Almost surely, 2^135538559 is an apocalyptic number.

135538559 is a deficient number, since it is larger than the sum of its proper divisors (10426057).

135538559 is a wasteful number, since it uses less digits than its factorization.

135538559 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10426056.

The product of its digits is 405000, while the sum is 44.

The square root of 135538559 is about 11642.1028598789. The cubic root of 135538559 is about 513.6740440195.

The spelling of 135538559 in words is "one hundred thirty-five million, five hundred thirty-eight thousand, five hundred fifty-nine".