643241793 has 4 divisors (see below), whose sum is σ = 857655728. Its totient is φ = 428827860.

The previous prime is 643241747. The next prime is 643241803. The reversal of 643241793 is 397142346.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 643241793 - 2⁹ = 643241281 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (643241593) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 107206963 + ... + 107206968.

It is an arithmetic number, because the mean of its divisors is an integer number (214413932).

Almost surely, 2^643241793 is an apocalyptic number.

It is an amenable number.

643241793 is a deficient number, since it is larger than the sum of its proper divisors (214413935).

643241793 is a wasteful number, since it uses less digits than its factorization.

643241793 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 214413934.

The product of its digits is 108864, while the sum is 39.

The square root of 643241793 is about 25362.2119106359. The cubic root of 643241793 is about 863.2264743372.

The spelling of 643241793 in words is "six hundred forty-three million, two hundred forty-one thousand, seven hundred ninety-three".