135521055 has 24 divisors (see below), whose sum is σ = 235946880. Its totient is φ = 71956800.

The previous prime is 135521051. The next prime is 135521063. The reversal of 135521055 is 550125531.

135521055 is a `hidden beast` number, since 1 + 3 + 552 + 105 + 5 = 666.

135521055 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 135521055 - 2² = 135521051 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135521051) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3730 + ... + 16880.

It is an arithmetic number, because the mean of its divisors is an integer number (9831120).

Almost surely, 2^135521055 is an apocalyptic number.

135521055 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

135521055 is a deficient number, since it is larger than the sum of its proper divisors (100425825).

135521055 is a wasteful number, since it uses less digits than its factorization.

135521055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13391 (or 13388 counting only the distinct ones).

The product of its (nonzero) digits is 3750, while the sum is 27.

The square root of 135521055 is about 11641.3510813823. The cubic root of 135521055 is about 513.6519304167.

Adding to 135521055 its reverse (550125531), we get a palindrome (685646586).

The spelling of 135521055 in words is "one hundred thirty-five million, five hundred twenty-one thousand, fifty-five".