3941188721 has 2 divisors, whose sum is σ = 3941188722. Its totient is φ = 3941188720.

The previous prime is 3941188687. The next prime is 3941188723. The reversal of 3941188721 is 1278811493.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3438532321 + 502656400 = 58639^2 + 22420^2 .

It is an emirp because it is prime and its reverse (1278811493) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3941188721 - 2²² = 3936994417 is a prime.

It is a Sophie Germain prime.

Together with 3941188723, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (3941188723) 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, 1970594360 + 1970594361.

It is an arithmetic number, because the mean of its divisors is an integer number (1970594361).

Almost surely, 2^3941188721 is an apocalyptic number.

It is an amenable number.

3941188721 is a deficient number, since it is larger than the sum of its proper divisors (1).

3941188721 is an equidigital number, since it uses as much as digits as its factorization.

3941188721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 96768, while the sum is 44.

The square root of 3941188721 is about 62778.8875419117. The cubic root of 3941188721 is about 1579.5828521410.

The spelling of 3941188721 in words is "three billion, nine hundred forty-one million, one hundred eighty-eight thousand, seven hundred twenty-one".