801681 has 4 divisors (see below), whose sum is σ = 1068912. Its totient is φ = 534452.

The previous prime is 801677. The next prime is 801683. The reversal of 801681 is 186108.

801681 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 801681 - 2² = 801677 is a prime.

It is a super-2 number, since 2×801681² = 1285384851522, which contains 22 as substring.

It is a D-number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (801683) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 133611 + ... + 133616.

It is an arithmetic number, because the mean of its divisors is an integer number (267228).

2⁸⁰¹⁶⁸¹ is an apocalyptic number.

It is an amenable number.

801681 is a deficient number, since it is larger than the sum of its proper divisors (267231).

801681 is a wasteful number, since it uses less digits than its factorization.

801681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 267230.

The product of its (nonzero) digits is 384, while the sum is 24.

The square root of 801681 is about 895.3664054453. The cubic root of 801681 is about 92.8967521072.

Adding to 801681 its reverse (186108), we get a palindrome (987789).

The spelling of 801681 in words is "eight hundred one thousand, six hundred eighty-one".