643530201 has 8 divisors (see below), whose sum is σ = 858366720. Its totient is φ = 428856912.

The previous prime is 643530197. The next prime is 643530211. The reversal of 643530201 is 102035346.

It is a happy number.

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

It is not a de Polignac number, because 643530201 - 2² = 643530197 is a prime.

It is a super-2 number, since 2×643530201² = 828262239198200802, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (643530211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31290 + ... + 47603.

It is an arithmetic number, because the mean of its divisors is an integer number (107295840).

Almost surely, 2^643530201 is an apocalyptic number.

It is an amenable number.

643530201 is a deficient number, since it is larger than the sum of its proper divisors (214836519).

643530201 is a wasteful number, since it uses less digits than its factorization.

643530201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81615.

The product of its (nonzero) digits is 2160, while the sum is 24.

The square root of 643530201 is about 25367.8970551364. The cubic root of 643530201 is about 863.3554689726.

Adding to 643530201 its reverse (102035346), we get a palindrome (745565547).

The spelling of 643530201 in words is "six hundred forty-three million, five hundred thirty thousand, two hundred one".