255424321 has 4 divisors (see below), whose sum is σ = 255729600. Its totient is φ = 255119044.

The previous prime is 255424289. The next prime is 255424327. The reversal of 255424321 is 123424552.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 255424321 - 2⁵ = 255424289 is a prime.

It is a super-2 number, since 2×255424321² = 130483167516622082, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 255424321.

It is not an unprimeable number, because it can be changed into a prime (255424327) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 151381 + ... + 153058.

It is an arithmetic number, because the mean of its divisors is an integer number (63932400).

Almost surely, 2^255424321 is an apocalyptic number.

It is an amenable number.

255424321 is a deficient number, since it is larger than the sum of its proper divisors (305279).

255424321 is an equidigital number, since it uses as much as digits as its factorization.

255424321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 305278.

The product of its digits is 9600, while the sum is 28.

The square root of 255424321 is about 15981.9999061444. Note that the first 4 decimals coincide. The cubic root of 255424321 is about 634.4841086517.

Adding to 255424321 its reverse (123424552), we get a palindrome (378848873).

The spelling of 255424321 in words is "two hundred fifty-five million, four hundred twenty-four thousand, three hundred twenty-one".