3981451811 has 2 divisors, whose sum is σ = 3981451812. Its totient is φ = 3981451810.

The previous prime is 3981451787. The next prime is 3981451819. The reversal of 3981451811 is 1181541893.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3981451811 is a prime.

It is not a weakly prime, because it can be changed into another prime (3981451819) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1990725905 + 1990725906.

It is an arithmetic number, because the mean of its divisors is an integer number (1990725906).

Almost surely, 2^3981451811 is an apocalyptic number.

3981451811 is a deficient number, since it is larger than the sum of its proper divisors (1).

3981451811 is an equidigital number, since it uses as much as digits as its factorization.

3981451811 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 34560, while the sum is 41.

The square root of 3981451811 is about 63098.7465089442. The cubic root of 3981451811 is about 1584.9436317596.

The spelling of 3981451811 in words is "three billion, nine hundred eighty-one million, four hundred fifty-one thousand, eight hundred eleven".