1280000001 has 24 divisors (see below), whose sum is σ = 1987895520. Its totient is φ = 730474752.

The previous prime is 1279999997. The next prime is 1280000003. The reversal of 1280000001 is 1000000821.

It is a happy number.

It is a Cunningham number, because it is equal to 20⁷+1.

It is not a de Polignac number, because 1280000001 - 2² = 1279999997 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1280000003) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 116305 + ... + 126833.

It is an arithmetic number, because the mean of its divisors is an integer number (82828980).

Almost surely, 2^1280000001 is an apocalyptic number.

It is an amenable number.

1280000001 is a deficient number, since it is larger than the sum of its proper divisors (707895519).

1280000001 is a wasteful number, since it uses less digits than its factorization.

1280000001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11373 (or 11366 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

The square root of 1280000001 is about 35777.0876539721. The cubic root of 1280000001 is about 1085.7670469207.

Adding to 1280000001 its reverse (1000000821), we get a palindrome (2280000822).

The spelling of 1280000001 in words is "one billion, two hundred eighty million, one", and thus it is an aban number.