255122321 has 2 divisors, whose sum is σ = 255122322. Its totient is φ = 255122320.

The previous prime is 255122317. The next prime is 255122323. The reversal of 255122321 is 123221552.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 186049600 + 69072721 = 13640^2 + 8311^2 .

It is a cyclic number.

It is not a de Polignac number, because 255122321 - 2² = 255122317 is a prime.

Together with 255122323, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (255122323) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 127561160 + 127561161.

It is an arithmetic number, because the mean of its divisors is an integer number (127561161).

Almost surely, 2^255122321 is an apocalyptic number.

It is an amenable number.

255122321 is a deficient number, since it is larger than the sum of its proper divisors (1).

255122321 is an equidigital number, since it uses as much as digits as its factorization.

255122321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1200, while the sum is 23.

The square root of 255122321 is about 15972.5489825513. The cubic root of 255122321 is about 634.2339500557.

Adding to 255122321 its reverse (123221552), we get a palindrome (378343873).

The spelling of 255122321 in words is "two hundred fifty-five million, one hundred twenty-two thousand, three hundred twenty-one".