255995009 has 2 divisors, whose sum is σ = 255995010. Its totient is φ = 255995008.

The previous prime is 255994987. The next prime is 255995011. The reversal of 255995009 is 900599552.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 162001984 + 93993025 = 12728^2 + 9695^2 .

It is a cyclic number.

It is not a de Polignac number, because 255995009 - 2¹⁶ = 255929473 is a prime.

Together with 255995011, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (255995029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 127997504 + 127997505.

It is an arithmetic number, because the mean of its divisors is an integer number (127997505).

Almost surely, 2^255995009 is an apocalyptic number.

It is an amenable number.

255995009 is a deficient number, since it is larger than the sum of its proper divisors (1).

255995009 is an equidigital number, since it uses as much as digits as its factorization.

255995009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 182250, while the sum is 44.

The square root of 255995009 is about 15999.8440304898. The cubic root of 255995009 is about 634.9562943445.

The spelling of 255995009 in words is "two hundred fifty-five million, nine hundred ninety-five thousand, nine".