3981565635 has 32 divisors (see below), whose sum is σ = 6539658240. Its totient is φ = 2067856128.

The previous prime is 3981565613. The next prime is 3981565639. The reversal of 3981565635 is 5365651893.

It is not a de Polignac number, because 3981565635 - 2¹³ = 3981557443 is a prime.

It is not an unprimeable number, because it can be changed into a prime (3981565639) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 63492 + ... + 109518.

It is an arithmetic number, because the mean of its divisors is an integer number (204364320).

Almost surely, 2^3981565635 is an apocalyptic number.

3981565635 is a deficient number, since it is larger than the sum of its proper divisors (2558092605).

3981565635 is a wasteful number, since it uses less digits than its factorization.

3981565635 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46187.

The product of its digits is 2916000, while the sum is 51.

The square root of 3981565635 is about 63099.6484538543. The cubic root of 3981565635 is about 1584.9587353712.

The spelling of 3981565635 in words is "three billion, nine hundred eighty-one million, five hundred sixty-five thousand, six hundred thirty-five".