6643201 has 2 divisors, whose sum is σ = 6643202. Its totient is φ = 6643200.

The previous prime is 6643181. The next prime is 6643211. The reversal of 6643201 is 1023466.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4626801 + 2016400 = 2151^2 + 1420^2 .

It is a cyclic number.

It is not a de Polignac number, because 6643201 - 2¹¹ = 6641153 is a prime.

It is not a weakly prime, because it can be changed into another prime (6643211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3321600 + 3321601.

It is an arithmetic number, because the mean of its divisors is an integer number (3321601).

Almost surely, 2^6643201 is an apocalyptic number.

It is an amenable number.

6643201 is a deficient number, since it is larger than the sum of its proper divisors (1).

6643201 is an equidigital number, since it uses as much as digits as its factorization.

6643201 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 22.

The square root of 6643201 is about 2577.4407849648. The cubic root of 6643201 is about 187.9861258058.

Adding to 6643201 its reverse (1023466), we get a palindrome (7666667).

The spelling of 6643201 in words is "six million, six hundred forty-three thousand, two hundred one".