135534321 has 24 divisors (see below), whose sum is σ = 211561896. Its totient is φ = 83116800.

The previous prime is 135534283. The next prime is 135534389. The reversal of 135534321 is 123435531.

It can be written as a sum of positive squares in 4 ways, for example, as 5574321 + 129960000 = 2361^2 + 11400^2 .

It is not a de Polignac number, because 135534321 - 2⁶ = 135534257 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (135534221) 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 23 ways as a sum of consecutive naturals, for example, 34771 + ... + 38471.

It is an arithmetic number, because the mean of its divisors is an integer number (8815079).

Almost surely, 2^135534321 is an apocalyptic number.

It is an amenable number.

135534321 is a deficient number, since it is larger than the sum of its proper divisors (76027575).

135534321 is a wasteful number, since it uses less digits than its factorization.

135534321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4033 (or 4030 counting only the distinct ones).

The product of its digits is 5400, while the sum is 27.

The square root of 135534321 is about 11641.9208466644. The cubic root of 135534321 is about 513.6686901352.

Adding to 135534321 its reverse (123435531), we get a palindrome (258969852).

The spelling of 135534321 in words is "one hundred thirty-five million, five hundred thirty-four thousand, three hundred twenty-one".