3981989907317 has 2 divisors, whose sum is σ = 3981989907318. Its totient is φ = 3981989907316.

The previous prime is 3981989907227. The next prime is 3981989907349. The reversal of 3981989907317 is 7137099891893.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3890180301316 + 91809606001 = 1972354^2 + 303001^2 .

It is a cyclic number.

It is not a de Polignac number, because 3981989907317 - 2¹⁴ = 3981989890933 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3981989901317) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1990994953658 + 1990994953659.

It is an arithmetic number, because the mean of its divisors is an integer number (1990994953659).

Almost surely, 2^{3981989907317} is an apocalyptic number.

It is an amenable number.

3981989907317 is a deficient number, since it is larger than the sum of its proper divisors (1).

3981989907317 is an equidigital number, since it uses as much as digits as its factorization.

3981989907317 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 185177664, while the sum is 74.

The spelling of 3981989907317 in words is "three trillion, nine hundred eighty-one billion, nine hundred eighty-nine million, nine hundred seven thousand, three hundred seventeen".