809001 has 24 divisors (see below), whose sum is σ = 1280160. Its totient is φ = 504792.

The previous prime is 808993. The next prime is 809023. The reversal of 809001 is 100908.

It is not a de Polignac number, because 809001 - 2³ = 808993 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (809041) 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, 9706 + ... + 9788.

It is an arithmetic number, because the mean of its divisors is an integer number (53340).

2⁸⁰⁹⁰⁰¹ is an apocalyptic number.

It is an amenable number.

809001 is a deficient number, since it is larger than the sum of its proper divisors (471159).

809001 is a wasteful number, since it uses less digits than its factorization.

809001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130 (or 105 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

The square root of 809001 is about 899.4448287694. Note that the first 3 decimals coincide. The cubic root of 809001 is about 93.1786368788.

Adding to 809001 its reverse (100908), we get a palindrome (909909).

The spelling of 809001 in words is "eight hundred nine thousand, one".