3720721541 has 6 divisors (see below), whose sum is σ = 3952462290. Its totient is φ = 3501855296.

The previous prime is 3720721513. The next prime is 3720721561. The reversal of 3720721541 is 1451270273.

3720721541 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 3 ways, for example, as 2002204516 + 1718517025 = 44746^2 + 41455^2 .

It is a de Polignac number, because none of the positive numbers 2^k-3720721541 is a prime.

It is a super-2 number, since 2×3720721541² = 27687537571322829362, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 3720721498 and 3720721507.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3720721561) 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 5 ways as a sum of consecutive naturals, for example, 6436946 + ... + 6437523.

It is an arithmetic number, because the mean of its divisors is an integer number (658743715).

Almost surely, 2^3720721541 is an apocalyptic number.

It is an amenable number.

3720721541 is a deficient number, since it is larger than the sum of its proper divisors (231740749).

3720721541 is a wasteful number, since it uses less digits than its factorization.

3720721541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12874503 (or 12874486 counting only the distinct ones).

The product of its (nonzero) digits is 11760, while the sum is 32.

The square root of 3720721541 is about 60997.7175064772. The cubic root of 3720721541 is about 1549.5623517782.

The spelling of 3720721541 in words is "three billion, seven hundred twenty million, seven hundred twenty-one thousand, five hundred forty-one".