801643 has 4 divisors (see below), whose sum is σ = 803440. Its totient is φ = 799848.

The previous prime is 801641. The next prime is 801677. The reversal of 801643 is 346108.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 801643 - 2¹ = 801641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (801641) 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, 346 + ... + 1312.

It is an arithmetic number, because the mean of its divisors is an integer number (200860).

2⁸⁰¹⁶⁴³ is an apocalyptic number.

801643 is a deficient number, since it is larger than the sum of its proper divisors (1797).

801643 is an equidigital number, since it uses as much as digits as its factorization.

801643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1796.

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 801643 is about 895.3451848310. The cubic root of 801643 is about 92.8952843029.

Subtracting from 801643 its reverse (346108), we obtain a triangular number (455535 = T₉₅₄).

It can be divided in two parts, 801 and 643, that added together give a square (1444 = 38²).

The spelling of 801643 in words is "eight hundred one thousand, six hundred forty-three".