3991560841 has 4 divisors (see below), whose sum is σ = 4129200900. Its totient is φ = 3853920784.

The previous prime is 3991560823. The next prime is 3991560877. The reversal of 3991560841 is 1480651993.

3991560841 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1501950025 + 2489610816 = 38755^2 + 49896^2 .

It is a cyclic number.

It is not a de Polignac number, because 3991560841 - 2¹¹ = 3991558793 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 3991560791 and 3991560800.

It is not an unprimeable number, because it can be changed into a prime (3991560821) 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 3 ways as a sum of consecutive naturals, for example, 68819986 + ... + 68820043.

It is an arithmetic number, because the mean of its divisors is an integer number (1032300225).

Almost surely, 2^3991560841 is an apocalyptic number.

It is an amenable number.

3991560841 is a deficient number, since it is larger than the sum of its proper divisors (137640059).

3991560841 is a wasteful number, since it uses less digits than its factorization.

3991560841 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137640058.

The product of its (nonzero) digits is 233280, while the sum is 46.

The square root of 3991560841 is about 63178.8005663292. The cubic root of 3991560841 is about 1586.2839051283.

The spelling of 3991560841 in words is "three billion, nine hundred ninety-one million, five hundred sixty thousand, eight hundred forty-one".