643313207 has 2 divisors, whose sum is σ = 643313208. Its totient is φ = 643313206.

The previous prime is 643313183. The next prime is 643313219. The reversal of 643313207 is 702313346.

It is a happy number.

643313207 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 643313207 - 2⁸ = 643312951 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 643313207.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (643313287) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321656603 + 321656604.

It is an arithmetic number, because the mean of its divisors is an integer number (321656604).

Almost surely, 2^643313207 is an apocalyptic number.

643313207 is a deficient number, since it is larger than the sum of its proper divisors (1).

643313207 is an equidigital number, since it uses as much as digits as its factorization.

643313207 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9072, while the sum is 29.

The square root of 643313207 is about 25363.6197534973. The cubic root of 643313207 is about 863.2584188693.

The spelling of 643313207 in words is "six hundred forty-three million, three hundred thirteen thousand, two hundred seven".