1280440559 has 2 divisors, whose sum is σ = 1280440560. Its totient is φ = 1280440558.

The previous prime is 1280440531. The next prime is 1280440573. The reversal of 1280440559 is 9550440821.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1280440559 - 2¹⁶ = 1280375023 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1280440159) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 640220279 + 640220280.

It is an arithmetic number, because the mean of its divisors is an integer number (640220280).

Almost surely, 2^1280440559 is an apocalyptic number.

1280440559 is a deficient number, since it is larger than the sum of its proper divisors (1).

1280440559 is an equidigital number, since it uses as much as digits as its factorization.

1280440559 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 57600, while the sum is 38.

The square root of 1280440559 is about 35783.2441094991. The cubic root of 1280440559 is about 1085.8916012147.

The spelling of 1280440559 in words is "one billion, two hundred eighty million, four hundred forty thousand, five hundred fifty-nine".