643359139 has 2 divisors, whose sum is σ = 643359140. Its totient is φ = 643359138.

The previous prime is 643359127. The next prime is 643359161. The reversal of 643359139 is 931953346.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 643359139 - 2¹³ = 643350947 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 643359095 and 643359104.

It is not a weakly prime, because it can be changed into another prime (643359539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321679569 + 321679570.

It is an arithmetic number, because the mean of its divisors is an integer number (321679570).

Almost surely, 2^643359139 is an apocalyptic number.

643359139 is a deficient number, since it is larger than the sum of its proper divisors (1).

643359139 is an equidigital number, since it uses as much as digits as its factorization.

643359139 is an evil number, because the sum of its binary digits is even.

The product of its digits is 262440, while the sum is 43.

The square root of 643359139 is about 25364.5252074625. The cubic root of 643359139 is about 863.2789636789.

The spelling of 643359139 in words is "six hundred forty-three million, three hundred fifty-nine thousand, one hundred thirty-nine".