1280865089 has 16 divisors (see below), whose sum is σ = 1472186880. Its totient is φ = 1091650560.

The previous prime is 1280865083. The next prime is 1280865139. The reversal of 1280865089 is 9805680821.

It is not a de Polignac number, because 1280865089 - 2²⁸ = 1012429633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1280865083) 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 in 15 ways as a sum of consecutive naturals, for example, 1405544 + ... + 1406454.

It is an arithmetic number, because the mean of its divisors is an integer number (92011680).

Almost surely, 2^1280865089 is an apocalyptic number.

It is an amenable number.

1280865089 is a deficient number, since it is larger than the sum of its proper divisors (191321791).

1280865089 is an equidigital number, since it uses as much as digits as its factorization.

1280865089 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1840.

The product of its (nonzero) digits is 276480, while the sum is 47.

The square root of 1280865089 is about 35789.1755842461. The cubic root of 1280865089 is about 1086.0115970553.

The spelling of 1280865089 in words is "one billion, two hundred eighty million, eight hundred sixty-five thousand, eighty-nine".