255311209 has 2 divisors, whose sum is σ = 255311210. Its totient is φ = 255311208.

The previous prime is 255311207. The next prime is 255311239. The reversal of 255311209 is 902113552.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 212343184 + 42968025 = 14572^2 + 6555^2 .

It is a cyclic number.

It is not a de Polignac number, because 255311209 - 2¹ = 255311207 is a prime.

Together with 255311207, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (255311207) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 127655604 + 127655605.

It is an arithmetic number, because the mean of its divisors is an integer number (127655605).

Almost surely, 2^255311209 is an apocalyptic number.

It is an amenable number.

255311209 is a deficient number, since it is larger than the sum of its proper divisors (1).

255311209 is an equidigital number, since it uses as much as digits as its factorization.

255311209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2700, while the sum is 28.

The square root of 255311209 is about 15978.4607831919. The cubic root of 255311209 is about 634.3904365969.

The spelling of 255311209 in words is "two hundred fifty-five million, three hundred eleven thousand, two hundred nine".