643041 has 24 divisors (see below), whose sum is σ = 1085760. Its totient is φ = 359136.

The previous prime is 643039. The next prime is 643043. The reversal of 643041 is 140346.

643041 = 74² + 75² + ... + 132².

It is an interprime number because it is at equal distance from previous prime (643039) and next prime (643043).

It is not a de Polignac number, because 643041 - 2¹ = 643039 is a prime.

643041 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (643043) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3631 + ... + 3803.

It is an arithmetic number, because the mean of its divisors is an integer number (45240).

2⁶⁴³⁰⁴¹ is an apocalyptic number.

It is an amenable number.

643041 is a deficient number, since it is larger than the sum of its proper divisors (442719).

643041 is a wasteful number, since it uses less digits than its factorization.

643041 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 245 (or 242 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 643041 is about 801.8983726134. The cubic root of 643041 is about 86.3136644005.

Adding to 643041 its reverse (140346), we get a palindrome (783387).

The spelling of 643041 in words is "six hundred forty-three thousand, forty-one".