641443 has 4 divisors (see below), whose sum is σ = 699768. Its totient is φ = 583120.

The previous prime is 641441. The next prime is 641453. The reversal of 641443 is 344146.

It is a happy number.

641443 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.

It is a cyclic number.

It is not a de Polignac number, because 641443 - 2¹ = 641441 is a prime.

It is a super-2 number, since 2×641443² = 822898244498, which contains 22 as substring.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (641441) 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, 29146 + ... + 29167.

It is an arithmetic number, because the mean of its divisors is an integer number (174942).

2⁶⁴¹⁴⁴³ is an apocalyptic number.

641443 is a deficient number, since it is larger than the sum of its proper divisors (58325).

641443 is a wasteful number, since it uses less digits than its factorization.

641443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58324.

The product of its digits is 1152, while the sum is 22.

The square root of 641443 is about 800.9013672107. The cubic root of 641443 is about 86.2421066781.

Adding to 641443 its reverse (344146), we get a palindrome (985589).

The spelling of 641443 in words is "six hundred forty-one thousand, four hundred forty-three".