3720541681 has 4 divisors (see below), whose sum is σ = 3939397092. Its totient is φ = 3501686272.

The previous prime is 3720541673. The next prime is 3720541687. The reversal of 3720541681 is 1861450273.

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 1796403456 + 1924138225 = 42384^2 + 43865^2 .

It is a cyclic number.

It is not a de Polignac number, because 3720541681 - 2³ = 3720541673 is a prime.

It is a super-2 number, since 2×3720541681² = 27684860800116611522, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 3720541681.

It is not an unprimeable number, because it can be changed into a prime (3720541687) 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, 109427680 + ... + 109427713.

It is an arithmetic number, because the mean of its divisors is an integer number (984849273).

Almost surely, 2^3720541681 is an apocalyptic number.

It is an amenable number.

3720541681 is a deficient number, since it is larger than the sum of its proper divisors (218855411).

3720541681 is a wasteful number, since it uses less digits than its factorization.

3720541681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 218855410.

The product of its (nonzero) digits is 40320, while the sum is 37.

The square root of 3720541681 is about 60996.2431711987. The cubic root of 3720541681 is about 1549.5373827167.

The spelling of 3720541681 in words is "three billion, seven hundred twenty million, five hundred forty-one thousand, six hundred eighty-one".