809901 has 6 divisors (see below), whose sum is σ = 1169870. Its totient is φ = 539928.

The previous prime is 809891. The next prime is 809903. The reversal of 809901 is 109908.

It can be written as a sum of positive squares in only one way, i.e., 585225 + 224676 = 765^2 + 474^2 .

It is not a de Polignac number, because 809901 - 2⁵ = 809869 is a prime.

It is a Duffinian number.

809901 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (809903) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 44986 + ... + 45003.

2⁸⁰⁹⁹⁰¹ is an apocalyptic number.

It is an amenable number.

809901 is a deficient number, since it is larger than the sum of its proper divisors (359969).

809901 is a wasteful number, since it uses less digits than its factorization.

809901 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89995 (or 89992 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 27.

The square root of 809901 is about 899.9449983193. The cubic root of 809901 is about 93.2131772953.

The spelling of 809901 in words is "eight hundred nine thousand, nine hundred one".