3985831987511 has 16 divisors (see below), whose sum is σ = 4429248894720. Its totient is φ = 3556549153920.

The previous prime is 3985831987411. The next prime is 3985831987531. The reversal of 3985831987511 is 1157891385893.

It is a cyclic number.

It is not a de Polignac number, because 3985831987511 - 2²⁶ = 3985764878647 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3985831987531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15438101 + ... + 15694158.

It is an arithmetic number, because the mean of its divisors is an integer number (276828055920).

Almost surely, 2^{3985831987511} is an apocalyptic number.

3985831987511 is a deficient number, since it is larger than the sum of its proper divisors (443416907209).

3985831987511 is a wasteful number, since it uses less digits than its factorization.

3985831987511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31132486.

The product of its digits is 65318400, while the sum is 68.

The spelling of 3985831987511 in words is "three trillion, nine hundred eighty-five billion, eight hundred thirty-one million, nine hundred eighty-seven thousand, five hundred eleven".