255834809 has 2 divisors, whose sum is σ = 255834810. Its totient is φ = 255834808.

The previous prime is 255834779. The next prime is 255834811. The reversal of 255834809 is 908438552.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 234702400 + 21132409 = 15320^2 + 4597^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-255834809 is a prime.

Together with 255834811, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 255834809.

It is not a weakly prime, because it can be changed into another prime (255834889) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 127917404 + 127917405.

It is an arithmetic number, because the mean of its divisors is an integer number (127917405).

Almost surely, 2^255834809 is an apocalyptic number.

It is an amenable number.

255834809 is a deficient number, since it is larger than the sum of its proper divisors (1).

255834809 is an equidigital number, since it uses as much as digits as its factorization.

255834809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 345600, while the sum is 44.

The square root of 255834809 is about 15994.8369482155. The cubic root of 255834809 is about 634.8238162092.

The spelling of 255834809 in words is "two hundred fifty-five million, eight hundred thirty-four thousand, eight hundred nine".