255312321 has 32 divisors (see below), whose sum is σ = 383594496. Its totient is φ = 149688000.

The previous prime is 255312251. The next prime is 255312331. The reversal of 255312321 is 123213552.

It is a happy number.

It is not a de Polignac number, because 255312321 - 2⁷ = 255312193 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 255312291 and 255312300.

It is not an unprimeable number, because it can be changed into a prime (255312331) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 257136 + ... + 258126.

It is an arithmetic number, because the mean of its divisors is an integer number (11987328).

Almost surely, 2^255312321 is an apocalyptic number.

It is an amenable number.

255312321 is a deficient number, since it is larger than the sum of its proper divisors (128282175).

255312321 is a wasteful number, since it uses less digits than its factorization.

255312321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1253.

The product of its digits is 1800, while the sum is 24.

The square root of 255312321 is about 15978.4955799975. The cubic root of 255312321 is about 634.3913576181.

Adding to 255312321 its reverse (123213552), we get a palindrome (378525873).

The spelling of 255312321 in words is "two hundred fifty-five million, three hundred twelve thousand, three hundred twenty-one".