3981036991 has 2 divisors, whose sum is σ = 3981036992. Its totient is φ = 3981036990.

The previous prime is 3981036979. The next prime is 3981037037. The reversal of 3981036991 is 1996301893.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 3981036991 - 2¹⁷ = 3980905919 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3981036691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1990518495 + 1990518496.

It is an arithmetic number, because the mean of its divisors is an integer number (1990518496).

Almost surely, 2^3981036991 is an apocalyptic number.

3981036991 is a deficient number, since it is larger than the sum of its proper divisors (1).

3981036991 is an equidigital number, since it uses as much as digits as its factorization.

3981036991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 314928, while the sum is 49.

The square root of 3981036991 is about 63095.4593532688. The cubic root of 3981036991 is about 1584.8885857460. Note that the first 3 decimals are identical.

The spelling of 3981036991 in words is "three billion, nine hundred eighty-one million, thirty-six thousand, nine hundred ninety-one".