643241541 has 16 divisors (see below), whose sum is σ = 873792000. Its totient is φ = 420786288.

The previous prime is 643241531. The next prime is 643241567. The reversal of 643241541 is 145142346.

It is not a de Polignac number, because 643241541 - 2¹⁵ = 643208773 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 643241499 and 643241508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643241531) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 102990 + ... + 109056.

It is an arithmetic number, because the mean of its divisors is an integer number (54612000).

Almost surely, 2^643241541 is an apocalyptic number.

It is an amenable number.

643241541 is a deficient number, since it is larger than the sum of its proper divisors (230550459).

643241541 is a wasteful number, since it uses less digits than its factorization.

643241541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6728.

The product of its digits is 11520, while the sum is 30.

The square root of 643241541 is about 25362.2069426144. The cubic root of 643241541 is about 863.2263616097.

Adding to 643241541 its reverse (145142346), we get a palindrome (788383887).

The spelling of 643241541 in words is "six hundred forty-three million, two hundred forty-one thousand, five hundred forty-one".