3861205643 has 2 divisors, whose sum is σ = 3861205644. Its totient is φ = 3861205642.

The previous prime is 3861205639. The next prime is 3861205679. The reversal of 3861205643 is 3465021683.

3861205643 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 3861205643 - 2² = 3861205639 is a prime.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 3861205597 and 3861205606.

It is not a weakly prime, because it can be changed into another prime (3861205043) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1930602821 + 1930602822.

It is an arithmetic number, because the mean of its divisors is an integer number (1930602822).

Almost surely, 2^3861205643 is an apocalyptic number.

3861205643 is a deficient number, since it is larger than the sum of its proper divisors (1).

3861205643 is an equidigital number, since it uses as much as digits as its factorization.

3861205643 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 103680, while the sum is 38.

The square root of 3861205643 is about 62138.6002658573. The cubic root of 3861205643 is about 1568.8243112304.

The spelling of 3861205643 in words is "three billion, eight hundred sixty-one million, two hundred five thousand, six hundred forty-three".