255215977 has 2 divisors, whose sum is σ = 255215978. Its totient is φ = 255215976.

The previous prime is 255215971. The next prime is 255216007. The reversal of 255215977 is 779512552.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 166177881 + 89038096 = 12891^2 + 9436^2 .

It is a cyclic number.

It is not a de Polignac number, because 255215977 - 2¹¹ = 255213929 is a prime.

It is not a weakly prime, because it can be changed into another prime (255215971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 127607988 + 127607989.

It is an arithmetic number, because the mean of its divisors is an integer number (127607989).

Almost surely, 2^255215977 is an apocalyptic number.

It is an amenable number.

255215977 is a deficient number, since it is larger than the sum of its proper divisors (1).

255215977 is an equidigital number, since it uses as much as digits as its factorization.

255215977 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 220500, while the sum is 43.

The square root of 255215977 is about 15975.4804935564. The cubic root of 255215977 is about 634.3115501489.

The spelling of 255215977 in words is "two hundred fifty-five million, two hundred fifteen thousand, nine hundred seventy-seven".