135225521 has 8 divisors (see below), whose sum is σ = 140178600. Its totient is φ = 130291840.

The previous prime is 135225481. The next prime is 135225523. The reversal of 135225521 is 125522531.

It can be written as a sum of positive squares in 4 ways, for example, as 29855296 + 105370225 = 5464^2 + 10265^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 135225521 - 2⁶ = 135225457 is a prime.

It is not an unprimeable number, because it can be changed into a prime (135225523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10181 + ... + 19341.

It is an arithmetic number, because the mean of its divisors is an integer number (17522325).

Almost surely, 2^135225521 is an apocalyptic number.

It is an amenable number.

135225521 is a deficient number, since it is larger than the sum of its proper divisors (4953079).

135225521 is an equidigital number, since it uses as much as digits as its factorization.

135225521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9699.

The product of its digits is 3000, while the sum is 26.

The square root of 135225521 is about 11628.6508675770. The cubic root of 135225521 is about 513.2782810004.

The spelling of 135225521 in words is "one hundred thirty-five million, two hundred twenty-five thousand, five hundred twenty-one".