3611721 has 8 divisors (see below), whose sum is σ = 4844160. Its totient is φ = 2393552.

The previous prime is 3611719. The next prime is 3611761. The reversal of 3611721 is 1271163.

3611721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 3611721 - 2¹ = 3611719 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (3611711) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2961 + ... + 3998.

It is an arithmetic number, because the mean of its divisors is an integer number (605520).

Almost surely, 2^3611721 is an apocalyptic number.

It is an amenable number.

3611721 is a deficient number, since it is larger than the sum of its proper divisors (1232439).

3611721 is a wasteful number, since it uses less digits than its factorization.

3611721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7135.

The product of its digits is 252, while the sum is 21.

The square root of 3611721 is about 1900.4528407724. The cubic root of 3611721 is about 153.4280380080.

Adding to 3611721 its reverse (1271163), we get a palindrome (4882884).

The spelling of 3611721 in words is "three million, six hundred eleven thousand, seven hundred twenty-one".