255977 has 2 divisors, whose sum is σ = 255978. Its totient is φ = 255976.

The previous prime is 255973. The next prime is 255989. The reversal of 255977 is 779552.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 137641 + 118336 = 371^2 + 344^2 .

It is a cyclic number.

It is not a de Polignac number, because 255977 - 2² = 255973 is a prime.

It is a Chen prime.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 255977.

It is not a weakly prime, because it can be changed into another prime (255971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 127988 + 127989.

It is an arithmetic number, because the mean of its divisors is an integer number (127989).

2²⁵⁵⁹⁷⁷ is an apocalyptic number.

It is an amenable number.

255977 is a deficient number, since it is larger than the sum of its proper divisors (1).

255977 is an equidigital number, since it uses as much as digits as its factorization.

255977 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 22050, while the sum is 35.

The square root of 255977 is about 505.9416962457. The cubic root of 255977 is about 63.4941404476.

The spelling of 255977 in words is "two hundred fifty-five thousand, nine hundred seventy-seven".