255185221 has 2 divisors, whose sum is σ = 255185222. Its totient is φ = 255185220.

The previous prime is 255185213. The next prime is 255185269. The reversal of 255185221 is 122581552.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 129072321 + 126112900 = 11361^2 + 11230^2 .

It is a cyclic number.

It is not a de Polignac number, because 255185221 - 2³ = 255185213 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (255186221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 127592610 + 127592611.

It is an arithmetic number, because the mean of its divisors is an integer number (127592611).

Almost surely, 2^255185221 is an apocalyptic number.

It is an amenable number.

255185221 is a deficient number, since it is larger than the sum of its proper divisors (1).

255185221 is an equidigital number, since it uses as much as digits as its factorization.

255185221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8000, while the sum is 31.

The square root of 255185221 is about 15974.5178643989. The cubic root of 255185221 is about 634.2860688945.

The spelling of 255185221 in words is "two hundred fifty-five million, one hundred eighty-five thousand, two hundred twenty-one".