255128717 has 2 divisors, whose sum is σ = 255128718. Its totient is φ = 255128716.

The previous prime is 255128669. The next prime is 255128723. The reversal of 255128717 is 717821552.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 223981156 + 31147561 = 14966^2 + 5581^2 .

It is a cyclic number.

It is not a de Polignac number, because 255128717 - 2¹⁶ = 255063181 is a prime.

It is a super-3 number, since 3×255128717³ (a number of 26 digits) contains 333 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (255128917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 127564358 + 127564359.

It is an arithmetic number, because the mean of its divisors is an integer number (127564359).

Almost surely, 2^255128717 is an apocalyptic number.

It is an amenable number.

255128717 is a deficient number, since it is larger than the sum of its proper divisors (1).

255128717 is an equidigital number, since it uses as much as digits as its factorization.

255128717 is an evil number, because the sum of its binary digits is even.

The product of its digits is 39200, while the sum is 38.

The square root of 255128717 is about 15972.7491998090. The cubic root of 255128717 is about 634.2392501622.

The spelling of 255128717 in words is "two hundred fifty-five million, one hundred twenty-eight thousand, seven hundred seventeen".