1255560305 has 4 divisors (see below), whose sum is σ = 1506672372. Its totient is φ = 1004448240.

The previous prime is 1255560283. The next prime is 1255560329. The reversal of 1255560305 is 5030655521.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5030655521 = 17 ⋅295920913.

It can be written as a sum of positive squares in 2 ways, for example, as 205865104 + 1049695201 = 14348^2 + 32399^2 .

It is not a de Polignac number, because 1255560305 - 2¹⁰ = 1255559281 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 125556026 + ... + 125556035.

It is an arithmetic number, because the mean of its divisors is an integer number (376668093).

Almost surely, 2^1255560305 is an apocalyptic number.

It is an amenable number.

1255560305 is a deficient number, since it is larger than the sum of its proper divisors (251112067).

1255560305 is an equidigital number, since it uses as much as digits as its factorization.

1255560305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 251112066.

The product of its (nonzero) digits is 22500, while the sum is 32.

The square root of 1255560305 is about 35433.8863942413. The cubic root of 1255560305 is about 1078.8122244080.

The spelling of 1255560305 in words is "one billion, two hundred fifty-five million, five hundred sixty thousand, three hundred five".