646205039 has 2 divisors, whose sum is σ = 646205040. Its totient is φ = 646205038.

The previous prime is 646204973. The next prime is 646205041. The reversal of 646205039 is 930502646.

646205039 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 646205039 - 2¹² = 646200943 is a prime.

Together with 646205041, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (646205239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323102519 + 323102520.

It is an arithmetic number, because the mean of its divisors is an integer number (323102520).

Almost surely, 2^646205039 is an apocalyptic number.

646205039 is a deficient number, since it is larger than the sum of its proper divisors (1).

646205039 is an equidigital number, since it uses as much as digits as its factorization.

646205039 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 38880, while the sum is 35.

The square root of 646205039 is about 25420.5633100449. The cubic root of 646205039 is about 864.5499965900.

The spelling of 646205039 in words is "six hundred forty-six million, two hundred five thousand, thirty-nine".