801209 has 4 divisors (see below), whose sum is σ = 818304. Its totient is φ = 784116.

The previous prime is 801197. The next prime is 801217. The reversal of 801209 is 902108.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 801209 - 2⁸ = 800953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (801289) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8477 + ... + 8570.

It is an arithmetic number, because the mean of its divisors is an integer number (204576).

2⁸⁰¹²⁰⁹ is an apocalyptic number.

It is an amenable number.

801209 is a deficient number, since it is larger than the sum of its proper divisors (17095).

801209 is a wasteful number, since it uses less digits than its factorization.

801209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17094.

The product of its (nonzero) digits is 144, while the sum is 20.

The square root of 801209 is about 895.1027873937. The cubic root of 801209 is about 92.8785171421.

The spelling of 801209 in words is "eight hundred one thousand, two hundred nine".