255804509 has 2 divisors, whose sum is σ = 255804510. Its totient is φ = 255804508.

The previous prime is 255804499. The next prime is 255804533. The reversal of 255804509 is 905408552.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 187279225 + 68525284 = 13685^2 + 8278^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-255804509 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 (255804209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 127902254 + 127902255.

It is an arithmetic number, because the mean of its divisors is an integer number (127902255).

Almost surely, 2^255804509 is an apocalyptic number.

It is an amenable number.

255804509 is a deficient number, since it is larger than the sum of its proper divisors (1).

255804509 is an equidigital number, since it uses as much as digits as its factorization.

255804509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72000, while the sum is 38.

The square root of 255804509 is about 15993.8897395224. The cubic root of 255804509 is about 634.7987532645.

The spelling of 255804509 in words is "two hundred fifty-five million, eight hundred four thousand, five hundred nine".