643228201 has 32 divisors (see below), whose sum is σ = 852000768. Its totient is φ = 470135040.

The previous prime is 643228181. The next prime is 643228211. The reversal of 643228201 is 102822346.

It is a cyclic number.

It is not a de Polignac number, because 643228201 - 2⁵ = 643228169 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 643228201.

It is not an unprimeable number, because it can be changed into a prime (643228211) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 500706 + ... + 501988.

It is an arithmetic number, because the mean of its divisors is an integer number (26625024).

Almost surely, 2^643228201 is an apocalyptic number.

It is an amenable number.

643228201 is a deficient number, since it is larger than the sum of its proper divisors (208772567).

643228201 is a wasteful number, since it uses less digits than its factorization.

643228201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1701.

The product of its (nonzero) digits is 4608, while the sum is 28.

The square root of 643228201 is about 25361.9439515192. The cubic root of 643228201 is about 863.2203941680.

The spelling of 643228201 in words is "six hundred forty-three million, two hundred twenty-eight thousand, two hundred one".