643002601 has 2 divisors, whose sum is σ = 643002602. Its totient is φ = 643002600.

The previous prime is 643002599. The next prime is 643002643. The reversal of 643002601 is 106200346.

643002601 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 515290000 + 127712601 = 22700^2 + 11301^2 .

It is a cyclic number.

It is not a de Polignac number, because 643002601 - 2¹ = 643002599 is a prime.

Together with 643002599, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (643002671) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321501300 + 321501301.

It is an arithmetic number, because the mean of its divisors is an integer number (321501301).

Almost surely, 2^643002601 is an apocalyptic number.

It is an amenable number.

643002601 is a deficient number, since it is larger than the sum of its proper divisors (1).

643002601 is an equidigital number, since it uses as much as digits as its factorization.

643002601 is an odious number, because the sum of its binary digits is odd.

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

The square root of 643002601 is about 25357.4959528736. The cubic root of 643002601 is about 863.1194630145.

Adding to 643002601 its reverse (106200346), we get a palindrome (749202947).

The spelling of 643002601 in words is "six hundred forty-three million, two thousand, six hundred one".