255881789 has 2 divisors, whose sum is σ = 255881790. Its totient is φ = 255881788.

The previous prime is 255881729. The next prime is 255881809. The reversal of 255881789 is 987188552.

255881789 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 255040900 + 840889 = 15970^2 + 917^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-255881789 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 255881789.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (255881729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 127940894 + 127940895.

It is an arithmetic number, because the mean of its divisors is an integer number (127940895).

Almost surely, 2^255881789 is an apocalyptic number.

It is an amenable number.

255881789 is a deficient number, since it is larger than the sum of its proper divisors (1).

255881789 is an equidigital number, since it uses as much as digits as its factorization.

255881789 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1612800, while the sum is 53.

The square root of 255881789 is about 15996.3054797037. The cubic root of 255881789 is about 634.8626722685.

The spelling of 255881789 in words is "two hundred fifty-five million, eight hundred eighty-one thousand, seven hundred eighty-nine".