255818239 has 2 divisors, whose sum is σ = 255818240. Its totient is φ = 255818238.

The previous prime is 255818221. The next prime is 255818243. The reversal of 255818239 is 932818552.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 255818239 - 2¹¹ = 255816191 is a prime.

It is a super-2 number, since 2×255818239² = 130885942810122242, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 255818195 and 255818204.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (255818209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 127909119 + 127909120.

It is an arithmetic number, because the mean of its divisors is an integer number (127909120).

Almost surely, 2^255818239 is an apocalyptic number.

255818239 is a deficient number, since it is larger than the sum of its proper divisors (1).

255818239 is an equidigital number, since it uses as much as digits as its factorization.

255818239 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 172800, while the sum is 43.

The square root of 255818239 is about 15994.3189601808. The cubic root of 255818239 is about 634.8101104150.

The spelling of 255818239 in words is "two hundred fifty-five million, eight hundred eighteen thousand, two hundred thirty-nine".