3951813641 has 2 divisors, whose sum is σ = 3951813642. Its totient is φ = 3951813640.

The previous prime is 3951813581. The next prime is 3951813683. The reversal of 3951813641 is 1463181593.

3951813641 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 can be written as a sum of positive squares in only one way, i.e., 2134070416 + 1817743225 = 46196^2 + 42635^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3951813641 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (3951816641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1975906820 + 1975906821.

It is an arithmetic number, because the mean of its divisors is an integer number (1975906821).

Almost surely, 2^3951813641 is an apocalyptic number.

It is an amenable number.

3951813641 is a deficient number, since it is larger than the sum of its proper divisors (1).

3951813641 is an equidigital number, since it uses as much as digits as its factorization.

3951813641 is an evil number, because the sum of its binary digits is even.

The product of its digits is 77760, while the sum is 41.

The square root of 3951813641 is about 62863.4523471309. The cubic root of 3951813641 is about 1581.0010268463.

The spelling of 3951813641 in words is "three billion, nine hundred fifty-one million, eight hundred thirteen thousand, six hundred forty-one".