641843 has 2 divisors, whose sum is σ = 641844. Its totient is φ = 641842.

The previous prime is 641833. The next prime is 641863. The reversal of 641843 is 348146.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 641843 - 2⁴ = 641827 is a prime.

It is not a weakly prime, because it can be changed into another prime (641803) 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 as a sum of consecutive naturals, namely, 320921 + 320922.

It is an arithmetic number, because the mean of its divisors is an integer number (320922).

2⁶⁴¹⁸⁴³ is an apocalyptic number.

641843 is a deficient number, since it is larger than the sum of its proper divisors (1).

641843 is an equidigital number, since it uses as much as digits as its factorization.

641843 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2304, while the sum is 26.

The square root of 641843 is about 801.1510469319. The cubic root of 641843 is about 86.2600296395.

Adding to 641843 its reverse (348146), we get a palindrome (989989).

The spelling of 641843 in words is "six hundred forty-one thousand, eight hundred forty-three".