3981311999 has 16 divisors (see below), whose sum is σ = 4685491200. Its totient is φ = 3311479584.

The previous prime is 3981311987. The next prime is 3981312043. The reversal of 3981311999 is 9991131893.

It is a happy number.

It is not a de Polignac number, because 3981311999 - 2⁸ = 3981311743 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 3981311999.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3981311909) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 77882 + ... + 118440.

It is an arithmetic number, because the mean of its divisors is an integer number (292843200).

Almost surely, 2^3981311999 is an apocalyptic number.

3981311999 is a deficient number, since it is larger than the sum of its proper divisors (704179201).

3981311999 is a wasteful number, since it uses less digits than its factorization.

3981311999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40982.

The product of its digits is 472392, while the sum is 53.

The square root of 3981311999 is about 63097.6386166709. The cubic root of 3981311999 is about 1584.9250793367.

The spelling of 3981311999 in words is "three billion, nine hundred eighty-one million, three hundred eleven thousand, nine hundred ninety-nine".