800000001 has 12 divisors (see below), whose sum is σ = 1160162640. Its totient is φ = 531207000.

The previous prime is 799999999. The next prime is 800000011. The reversal of 800000001 is 100000008.

It is not a de Polignac number, because 800000001 - 2¹ = 799999999 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is not an unprimeable number, because it can be changed into a prime (800000011) 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 11 ways as a sum of consecutive naturals, for example, 174811 + ... + 179328.

It is an arithmetic number, because the mean of its divisors is an integer number (96680220).

Almost surely, 2^800000001 is an apocalyptic number.

It is an amenable number.

800000001 is a deficient number, since it is larger than the sum of its proper divisors (360162639).

800000001 is a wasteful number, since it uses less digits than its factorization.

800000001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 354396 (or 354393 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

The square root of 800000001 is about 28284.2712651396. The cubic root of 800000001 is about 928.3177671094.

Adding to 800000001 its reverse (100000008), we get a palindrome (900000009).

The spelling of 800000001 in words is "eight hundred million, one", and thus it is an aban number.