255621323 has 4 divisors (see below), whose sum is σ = 256169160. Its totient is φ = 255073488.

The previous prime is 255621251. The next prime is 255621329. The reversal of 255621323 is 323126552.

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

It is a cyclic number.

It is not a de Polignac number, because 255621323 - 2²⁴ = 238844107 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (255621329) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 273218 + ... + 274151.

It is an arithmetic number, because the mean of its divisors is an integer number (64042290).

Almost surely, 2^255621323 is an apocalyptic number.

255621323 is a deficient number, since it is larger than the sum of its proper divisors (547837).

255621323 is an equidigital number, since it uses as much as digits as its factorization.

255621323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 547836.

The product of its digits is 10800, while the sum is 29.

The square root of 255621323 is about 15988.1619644035. The cubic root of 255621323 is about 634.6471869843.

Adding to 255621323 its reverse (323126552), we get a palindrome (578747875).

The spelling of 255621323 in words is "two hundred fifty-five million, six hundred twenty-one thousand, three hundred twenty-three".