1280500729 has 2 divisors, whose sum is σ = 1280500730. Its totient is φ = 1280500728.

The previous prime is 1280500709. The next prime is 1280500733. The reversal of 1280500729 is 9270050821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1278205504 + 2295225 = 35752^2 + 1515^2 .

It is a cyclic number.

It is not a de Polignac number, because 1280500729 - 2⁹ = 1280500217 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1280500694 and 1280500703.

It is not a weakly prime, because it can be changed into another prime (1280500709) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 640250364 + 640250365.

It is an arithmetic number, because the mean of its divisors is an integer number (640250365).

Almost surely, 2^1280500729 is an apocalyptic number.

It is an amenable number.

1280500729 is a deficient number, since it is larger than the sum of its proper divisors (1).

1280500729 is an equidigital number, since it uses as much as digits as its factorization.

1280500729 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10080, while the sum is 34.

The square root of 1280500729 is about 35784.0848562598. The cubic root of 1280500729 is about 1085.9086102236.

The spelling of 1280500729 in words is "one billion, two hundred eighty million, five hundred thousand, seven hundred twenty-nine".