135523321 has 4 divisors (see below), whose sum is σ = 135872100. Its totient is φ = 135174544.

The previous prime is 135523319. The next prime is 135523363. The reversal of 135523321 is 123325531.

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

It can be written as a sum of positive squares in 2 ways, for example, as 97219600 + 38303721 = 9860^2 + 6189^2 .

It is a cyclic number.

It is not a de Polignac number, because 135523321 - 2¹ = 135523319 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (135523391) 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, 173806 + ... + 174583.

It is an arithmetic number, because the mean of its divisors is an integer number (33968025).

Almost surely, 2^135523321 is an apocalyptic number.

It is an amenable number.

135523321 is a deficient number, since it is larger than the sum of its proper divisors (348779).

135523321 is an equidigital number, since it uses as much as digits as its factorization.

135523321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 348778.

The product of its digits is 2700, while the sum is 25.

The square root of 135523321 is about 11641.4484064484. The cubic root of 135523321 is about 513.6547932653.

Adding to 135523321 its reverse (123325531), we get a palindrome (258848852).

The spelling of 135523321 in words is "one hundred thirty-five million, five hundred twenty-three thousand, three hundred twenty-one".