801921 has 4 divisors (see below), whose sum is σ = 1069232. Its totient is φ = 534612.

The previous prime is 801883. The next prime is 801947. The reversal of 801921 is 129108.

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 not a de Polignac number, because 801921 - 2¹⁰ = 800897 is a prime.

It is a D-number.

It is the 896-th Hogben number.

It is a Duffinian number.

It is a Curzon number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 801921.

It is not an unprimeable number, because it can be changed into a prime (801421) by changing a digit.

It is a nontrivial repunit in base 895.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 133651 + ... + 133656.

It is an arithmetic number, because the mean of its divisors is an integer number (267308).

2⁸⁰¹⁹²¹ is an apocalyptic number.

It is an amenable number.

801921 is a deficient number, since it is larger than the sum of its proper divisors (267311).

801921 is a wasteful number, since it uses less digits than its factorization.

801921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 267310.

The product of its (nonzero) digits is 144, while the sum is 21.

The square root of 801921 is about 895.5004187604. The cubic root of 801921 is about 92.9060213785.

The spelling of 801921 in words is "eight hundred one thousand, nine hundred twenty-one".