1280006091 has 32 divisors (see below), whose sum is σ = 2333918720. Its totient is φ = 675166752.

The previous prime is 1280006059. The next prime is 1280006137. The reversal of 1280006091 is 1906000821.

It is not a de Polignac number, because 1280006091 - 2⁵ = 1280006059 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (1280006191) 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 in 31 ways as a sum of consecutive naturals, for example, 258025 + ... + 262938.

It is an arithmetic number, because the mean of its divisors is an integer number (72934960).

Almost surely, 2^1280006091 is an apocalyptic number.

1280006091 is a deficient number, since it is larger than the sum of its proper divisors (1053912629).

1280006091 is a wasteful number, since it uses less digits than its factorization.

1280006091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 520992 (or 520986 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 27.

The square root of 1280006091 is about 35777.1727642082. The cubic root of 1280006091 is about 1085.7687688767.

The spelling of 1280006091 in words is "one billion, two hundred eighty million, six thousand, ninety-one".