643410321 has 8 divisors (see below), whose sum is σ = 864635904. Its totient is φ = 425562480.

The previous prime is 643410263. The next prime is 643410331. The reversal of 643410321 is 123014346.

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

It is not a de Polignac number, because 643410321 - 2⁷ = 643410193 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 643410291 and 643410300.

It is not an unprimeable number, because it can be changed into a prime (643410331) 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, 843990 + ... + 844751.

It is an arithmetic number, because the mean of its divisors is an integer number (108079488).

Almost surely, 2^643410321 is an apocalyptic number.

It is an amenable number.

643410321 is a deficient number, since it is larger than the sum of its proper divisors (221225583).

643410321 is a wasteful number, since it uses less digits than its factorization.

643410321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1688871.

The product of its (nonzero) digits is 1728, while the sum is 24.

The square root of 643410321 is about 25365.5341161979. The cubic root of 643410321 is about 863.3018555960.

Adding to 643410321 its reverse (123014346), we get a palindrome (766424667).

The spelling of 643410321 in words is "six hundred forty-three million, four hundred ten thousand, three hundred twenty-one".