255135321 has 24 divisors (see below), whose sum is σ = 425917440. Its totient is φ = 144150336.

The previous prime is 255135299. The next prime is 255135341. The reversal of 255135321 is 123531552.

It is a happy number.

It is not a de Polignac number, because 255135321 - 2⁹ = 255134809 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (255135341) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 17145 + ... + 28358.

It is an arithmetic number, because the mean of its divisors is an integer number (17746560).

Almost surely, 2^255135321 is an apocalyptic number.

255135321 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

255135321 is a deficient number, since it is larger than the sum of its proper divisors (170782119).

255135321 is a wasteful number, since it uses less digits than its factorization.

255135321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45605 (or 45602 counting only the distinct ones).

The product of its digits is 4500, while the sum is 27.

The square root of 255135321 is about 15972.9559255637. The cubic root of 255135321 is about 634.2447225370.

Adding to 255135321 its reverse (123531552), we get a palindrome (378666873).

The spelling of 255135321 in words is "two hundred fifty-five million, one hundred thirty-five thousand, three hundred twenty-one".