641543 has 8 divisors (see below), whose sum is σ = 753312. Its totient is φ = 534816.

The previous prime is 641521. The next prime is 641549. The reversal of 641543 is 345146.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 641543 - 2⁶ = 641479 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641549) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 980 + ... + 1497.

It is an arithmetic number, because the mean of its divisors is an integer number (94164).

2⁶⁴¹⁵⁴³ is an apocalyptic number.

641543 is a deficient number, since it is larger than the sum of its proper divisors (111769).

641543 is a wasteful number, since it uses less digits than its factorization.

641543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2521.

The product of its digits is 1440, while the sum is 23.

The square root of 641543 is about 800.9637944377. The cubic root of 641543 is about 86.2465881168.

Adding to 641543 its reverse (345146), we get a palindrome (986689).

The spelling of 641543 in words is "six hundred forty-one thousand, five hundred forty-three".