3681486721 has 32 divisors (see below), whose sum is σ = 4310438400. Its totient is φ = 3108948480.

The previous prime is 3681486673. The next prime is 3681486749. The reversal of 3681486721 is 1276841863.

It is a happy number.

It is not a de Polignac number, because 3681486721 - 2⁹ = 3681486209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3681486121) 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 31 ways as a sum of consecutive naturals, for example, 3962385 + ... + 3963313.

It is an arithmetic number, because the mean of its divisors is an integer number (134701200).

Almost surely, 2^3681486721 is an apocalyptic number.

It is an amenable number.

3681486721 is a deficient number, since it is larger than the sum of its proper divisors (628951679).

3681486721 is a wasteful number, since it uses less digits than its factorization.

3681486721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1309.

The product of its digits is 387072, while the sum is 46.

The square root of 3681486721 is about 60675.2562499739. The cubic root of 3681486721 is about 1544.0964083413.

The spelling of 3681486721 in words is "three billion, six hundred eighty-one million, four hundred eighty-six thousand, seven hundred twenty-one".