3865131611 has 16 divisors (see below), whose sum is σ = 4481192160. Its totient is φ = 3294727680.

The previous prime is 3865131533. The next prime is 3865131617. The reversal of 3865131611 is 1161315683.

It is a cyclic number.

It is not a de Polignac number, because 3865131611 - 2¹⁸ = 3864869467 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3865131617) 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, 11885 + ... + 88721.

It is an arithmetic number, because the mean of its divisors is an integer number (280074510).

Almost surely, 2^3865131611 is an apocalyptic number.

3865131611 is a deficient number, since it is larger than the sum of its proper divisors (616060549).

3865131611 is a wasteful number, since it uses less digits than its factorization.

3865131611 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77134.

The product of its digits is 12960, while the sum is 35.

The square root of 3865131611 is about 62170.1826521364. The cubic root of 3865131611 is about 1569.3558436329.

The spelling of 3865131611 in words is "three billion, eight hundred sixty-five million, one hundred thirty-one thousand, six hundred eleven".