255791869 has 2 divisors, whose sum is σ = 255791870. Its totient is φ = 255791868.

The previous prime is 255791839. The next prime is 255791873. The reversal of 255791869 is 968197552.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 202720644 + 53071225 = 14238^2 + 7285^2 .

It is a cyclic number.

It is not a de Polignac number, because 255791869 - 2²¹ = 253694717 is a prime.

It is a super-2 number, since 2×255791869² = 130858960493026322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (255791839) 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, 127895934 + 127895935.

It is an arithmetic number, because the mean of its divisors is an integer number (127895935).

Almost surely, 2^255791869 is an apocalyptic number.

It is an amenable number.

255791869 is a deficient number, since it is larger than the sum of its proper divisors (1).

255791869 is an equidigital number, since it uses as much as digits as its factorization.

255791869 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1360800, while the sum is 52.

The square root of 255791869 is about 15993.4945837362. The cubic root of 255791869 is about 634.7882973784.

The spelling of 255791869 in words is "two hundred fifty-five million, seven hundred ninety-one thousand, eight hundred sixty-nine".