255928909 has 2 divisors, whose sum is σ = 255928910. Its totient is φ = 255928908.

The previous prime is 255928873. The next prime is 255928969. The reversal of 255928909 is 909829552.

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., 250335684 + 5593225 = 15822^2 + 2365^2 .

It is a cyclic number.

It is not a de Polignac number, because 255928909 - 2⁹ = 255928397 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (255928969) 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, 127964454 + 127964455.

It is an arithmetic number, because the mean of its divisors is an integer number (127964455).

Almost surely, 2^255928909 is an apocalyptic number.

It is an amenable number.

255928909 is a deficient number, since it is larger than the sum of its proper divisors (1).

255928909 is an equidigital number, since it uses as much as digits as its factorization.

255928909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 583200, while the sum is 49.

The square root of 255928909 is about 15997.7782519949. The cubic root of 255928909 is about 634.9016393415.

The spelling of 255928909 in words is "two hundred fifty-five million, nine hundred twenty-eight thousand, nine hundred nine".