255977221 has 2 divisors, whose sum is σ = 255977222. Its totient is φ = 255977220.

The previous prime is 255977213. The next prime is 255977243. The reversal of 255977221 is 122779552.

255977221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 218596225 + 37380996 = 14785^2 + 6114^2 .

It is a cyclic number.

It is not a de Polignac number, because 255977221 - 2³ = 255977213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (255977021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 127988610 + 127988611.

It is an arithmetic number, because the mean of its divisors is an integer number (127988611).

Almost surely, 2^255977221 is an apocalyptic number.

It is an amenable number.

255977221 is a deficient number, since it is larger than the sum of its proper divisors (1).

255977221 is an equidigital number, since it uses as much as digits as its factorization.

255977221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 88200, while the sum is 40.

The square root of 255977221 is about 15999.2881404142. The cubic root of 255977221 is about 634.9415872034.

The spelling of 255977221 in words is "two hundred fifty-five million, nine hundred seventy-seven thousand, two hundred twenty-one".