255305639 has 2 divisors, whose sum is σ = 255305640. Its totient is φ = 255305638.

The previous prime is 255305627. The next prime is 255305653. The reversal of 255305639 is 936503552.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 255305639 - 2⁴ = 255305623 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (255305669) 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, 127652819 + 127652820.

It is an arithmetic number, because the mean of its divisors is an integer number (127652820).

Almost surely, 2^255305639 is an apocalyptic number.

255305639 is a deficient number, since it is larger than the sum of its proper divisors (1).

255305639 is an equidigital number, since it uses as much as digits as its factorization.

255305639 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 121500, while the sum is 38.

The square root of 255305639 is about 15978.2864851022. The cubic root of 255305639 is about 634.3858231678.

The spelling of 255305639 in words is "two hundred fifty-five million, three hundred five thousand, six hundred thirty-nine".