135231321 has 8 divisors (see below), whose sum is σ = 186526080. Its totient is φ = 87045392.

The previous prime is 135231307. The next prime is 135231353. The reversal of 135231321 is 123132531.

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 135231321 - 2¹¹ = 135229273 is a prime.

It is not an unprimeable number, because it can be changed into a prime (135231121) 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, 777105 + ... + 777278.

It is an arithmetic number, because the mean of its divisors is an integer number (23315760).

Almost surely, 2^135231321 is an apocalyptic number.

It is an amenable number.

135231321 is a deficient number, since it is larger than the sum of its proper divisors (51294759).

135231321 is a wasteful number, since it uses less digits than its factorization.

135231321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1554415.

The product of its digits is 540, while the sum is 21.

The square root of 135231321 is about 11628.9002489487. The cubic root of 135231321 is about 513.2856192885.

Adding to 135231321 its reverse (123132531), we get a palindrome (258363852).

The spelling of 135231321 in words is "one hundred thirty-five million, two hundred thirty-one thousand, three hundred twenty-one".