643325201 has 4 divisors (see below), whose sum is σ = 643376100. Its totient is φ = 643274304.

The previous prime is 643325191. The next prime is 643325233. The reversal of 643325201 is 102523346.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 102523346 = 2 ⋅51261673.

It can be written as a sum of positive squares in 2 ways, for example, as 141610000 + 501715201 = 11900^2 + 22399^2 .

It is a cyclic number.

It is not a de Polignac number, because 643325201 - 2¹⁴ = 643308817 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (643325251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9605 + ... + 37133.

It is an arithmetic number, because the mean of its divisors is an integer number (160844025).

Almost surely, 2^643325201 is an apocalyptic number.

It is an amenable number.

643325201 is a deficient number, since it is larger than the sum of its proper divisors (50899).

643325201 is a wasteful number, since it uses less digits than its factorization.

643325201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50898.

The product of its (nonzero) digits is 4320, while the sum is 26.

The square root of 643325201 is about 25363.8561934103. The cubic root of 643325201 is about 863.2637837299.

Adding to 643325201 its reverse (102523346), we get a palindrome (745848547).

The spelling of 643325201 in words is "six hundred forty-three million, three hundred twenty-five thousand, two hundred one".