3941656591 has 2 divisors, whose sum is σ = 3941656592. Its totient is φ = 3941656590.

The previous prime is 3941656577. The next prime is 3941656639. The reversal of 3941656591 is 1956561493.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 3941656591 - 2⁵ = 3941656559 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3941656531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1970828295 + 1970828296.

It is an arithmetic number, because the mean of its divisors is an integer number (1970828296).

Almost surely, 2^3941656591 is an apocalyptic number.

3941656591 is a deficient number, since it is larger than the sum of its proper divisors (1).

3941656591 is an equidigital number, since it uses as much as digits as its factorization.

3941656591 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 874800, while the sum is 49.

The square root of 3941656591 is about 62782.6137636846. The cubic root of 3941656591 is about 1579.6453552958.

The spelling of 3941656591 in words is "three billion, nine hundred forty-one million, six hundred fifty-six thousand, five hundred ninety-one".