641143 has 2 divisors, whose sum is σ = 641144. Its totient is φ = 641142.

The previous prime is 641131. The next prime is 641167. The reversal of 641143 is 341146.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 641143 - 2⁹ = 640631 is a prime.

It is a super-2 number, since 2×641143² = 822128692898, which contains 22 as substring.

641143 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 641143.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (641843) 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, 320571 + 320572.

It is an arithmetic number, because the mean of its divisors is an integer number (320572).

2⁶⁴¹¹⁴³ is an apocalyptic number.

641143 is a deficient number, since it is larger than the sum of its proper divisors (1).

641143 is an equidigital number, since it uses as much as digits as its factorization.

641143 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 288, while the sum is 19.

The square root of 641143 is about 800.7140563272. The cubic root of 641143 is about 86.2286595666.

Adding to 641143 its reverse (341146), we get a palindrome (982289).

It can be divided in two parts, 641 and 143, that added together give a square (784 = 28²).

The spelling of 641143 in words is "six hundred forty-one thousand, one hundred forty-three".