643270339 has 2 divisors, whose sum is σ = 643270340. Its totient is φ = 643270338.

The previous prime is 643270321. The next prime is 643270349. The reversal of 643270339 is 933072346.

643270339 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 643270339 - 2⁵ = 643270307 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 643270298 and 643270307.

It is not a weakly prime, because it can be changed into another prime (643270349) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321635169 + 321635170.

It is an arithmetic number, because the mean of its divisors is an integer number (321635170).

Almost surely, 2^643270339 is an apocalyptic number.

643270339 is a deficient number, since it is larger than the sum of its proper divisors (1).

643270339 is an equidigital number, since it uses as much as digits as its factorization.

643270339 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 81648, while the sum is 37.

The square root of 643270339 is about 25362.7746707650. The cubic root of 643270339 is about 863.2392436663.

It can be divided in two parts, 64 and 3270339, that added together give a triangular number (3270403 = T₂₅₅₇).

The spelling of 643270339 in words is "six hundred forty-three million, two hundred seventy thousand, three hundred thirty-nine".