643550341 has 16 divisors (see below), whose sum is σ = 756480384. Its totient is φ = 536001984.

The previous prime is 643550333. The next prime is 643550357. The reversal of 643550341 is 143055346.

643550341 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 643550341 - 2³ = 643550333 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643550381) 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, 53871 + ... + 64723.

It is an arithmetic number, because the mean of its divisors is an integer number (47280024).

Almost surely, 2^643550341 is an apocalyptic number.

It is an amenable number.

643550341 is a deficient number, since it is larger than the sum of its proper divisors (112930043).

643550341 is a wasteful number, since it uses less digits than its factorization.

643550341 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11100.

The product of its (nonzero) digits is 21600, while the sum is 31.

The square root of 643550341 is about 25368.2940104375. The cubic root of 643550341 is about 863.3644754381.

The spelling of 643550341 in words is "six hundred forty-three million, five hundred fifty thousand, three hundred forty-one".