3681387841 has 4 divisors (see below), whose sum is σ = 3681514800. Its totient is φ = 3681260884.

The previous prime is 3681387821. The next prime is 3681387863. The reversal of 3681387841 is 1487831863.

It is a happy number.

3681387841 is digitally balanced in base 2, 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, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 3681387841 - 2⁷ = 3681387713 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3681387821) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3750 + ... + 85888.

It is an arithmetic number, because the mean of its divisors is an integer number (920378700).

Almost surely, 2^3681387841 is an apocalyptic number.

It is an amenable number.

3681387841 is a deficient number, since it is larger than the sum of its proper divisors (126959).

3681387841 is an equidigital number, since it uses as much as digits as its factorization.

3681387841 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126958.

The product of its digits is 774144, while the sum is 49.

The square root of 3681387841 is about 60674.4414148165. The cubic root of 3681387841 is about 1544.0825840695.

The spelling of 3681387841 in words is "three billion, six hundred eighty-one million, three hundred eighty-seven thousand, eight hundred forty-one".