135521056 has 48 divisors (see below), whose sum is σ = 292057920. Its totient is φ = 61390080.

The previous prime is 135521051. The next prime is 135521063. The reversal of 135521056 is 650125531.

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 7 ways as a sum of consecutive naturals, for example, 154090 + ... + 154966.

It is an arithmetic number, because the mean of its divisors is an integer number (6084540).

Almost surely, 2^135521056 is an apocalyptic number.

135521056 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 135521056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (146028960).

135521056 is an abundant number, since it is smaller than the sum of its proper divisors (156536864).

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

135521056 is a wasteful number, since it uses less digits than its factorization.

135521056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1337 (or 1329 counting only the distinct ones).

The product of its (nonzero) digits is 4500, while the sum is 28.

The square root of 135521056 is about 11641.3511243326. The cubic root of 135521056 is about 513.6519316801.

Adding to 135521056 its reverse (650125531), we get a palindrome (785646587).

The spelling of 135521056 in words is "one hundred thirty-five million, five hundred twenty-one thousand, fifty-six".