3954981887491 has 2 divisors, whose sum is σ = 3954981887492. Its totient is φ = 3954981887490.

The previous prime is 3954981887473. The next prime is 3954981887539. The reversal of 3954981887491 is 1947881894593.

3954981887491 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 3954981887491 - 2²⁷ = 3954847669763 is a prime.

It is not a weakly prime, because it can be changed into another prime (3954981887411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1977490943745 + 1977490943746.

It is an arithmetic number, because the mean of its divisors is an integer number (1977490943746).

Almost surely, 2^{3954981887491} is an apocalyptic number.

3954981887491 is a deficient number, since it is larger than the sum of its proper divisors (1).

3954981887491 is an equidigital number, since it uses as much as digits as its factorization.

3954981887491 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 627056640, while the sum is 76.

The spelling of 3954981887491 in words is "three trillion, nine hundred fifty-four billion, nine hundred eighty-one million, eight hundred eighty-seven thousand, four hundred ninety-one".