1280008001 has 4 divisors (see below), whose sum is σ = 1283298900. Its totient is φ = 1276717104.

The previous prime is 1280007977. The next prime is 1280008021. The reversal of 1280008001 is 1008000821.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 682254400 + 597753601 = 26120^2 + 24449^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1280008001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1280008021) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1644866 + ... + 1645643.

It is an arithmetic number, because the mean of its divisors is an integer number (320824725).

Almost surely, 2^1280008001 is an apocalyptic number.

It is an amenable number.

1280008001 is a deficient number, since it is larger than the sum of its proper divisors (3290899).

1280008001 is an equidigital number, since it uses as much as digits as its factorization.

1280008001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3290898.

The product of its (nonzero) digits is 128, while the sum is 20.

The square root of 1280008001 is about 35777.1994571962. The cubic root of 1280008001 is about 1085.7693089307.

Adding to 1280008001 its reverse (1008000821), we get a palindrome (2288008822).

The spelling of 1280008001 in words is "one billion, two hundred eighty million, eight thousand, one".