1280455889 has 2 divisors, whose sum is σ = 1280455890. Its totient is φ = 1280455888.

The previous prime is 1280455877. The next prime is 1280455901. The reversal of 1280455889 is 9885540821.

It is a balanced prime because it is at equal distance from previous prime (1280455877) and next prime (1280455901).

It can be written as a sum of positive squares in only one way, i.e., 852172864 + 428283025 = 29192^2 + 20695^2 .

It is a cyclic number.

It is not a de Polignac number, because 1280455889 - 2⁴ = 1280455873 is a prime.

It is not a weakly prime, because it can be changed into another prime (1280455859) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 640227944 + 640227945.

It is an arithmetic number, because the mean of its divisors is an integer number (640227945).

Almost surely, 2^1280455889 is an apocalyptic number.

It is an amenable number.

1280455889 is a deficient number, since it is larger than the sum of its proper divisors (1).

1280455889 is an equidigital number, since it uses as much as digits as its factorization.

1280455889 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 921600, while the sum is 50.

The square root of 1280455889 is about 35783.4583152607. The cubic root of 1280455889 is about 1085.8959347888.

The spelling of 1280455889 in words is "one billion, two hundred eighty million, four hundred fifty-five thousand, eight hundred eighty-nine".