1255485809 has 2 divisors, whose sum is σ = 1255485810. Its totient is φ = 1255485808.

The previous prime is 1255485787. The next prime is 1255485817. The reversal of 1255485809 is 9085845521.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1186595809 + 68890000 = 34447^2 + 8300^2 .

It is a cyclic number.

It is not a de Polignac number, because 1255485809 - 2²⁴ = 1238708593 is a prime.

It is not a weakly prime, because it can be changed into another prime (1255485899) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 627742904 + 627742905.

It is an arithmetic number, because the mean of its divisors is an integer number (627742905).

Almost surely, 2^1255485809 is an apocalyptic number.

It is an amenable number.

1255485809 is a deficient number, since it is larger than the sum of its proper divisors (1).

1255485809 is an equidigital number, since it uses as much as digits as its factorization.

1255485809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576000, while the sum is 47.

The square root of 1255485809 is about 35432.8351815093. The cubic root of 1255485809 is about 1078.7908876432.

The spelling of 1255485809 in words is "one billion, two hundred fifty-five million, four hundred eighty-five thousand, eight hundred nine".