3611401721 has 2 divisors, whose sum is σ = 3611401722. Its totient is φ = 3611401720.

The previous prime is 3611401711. The next prime is 3611401733. The reversal of 3611401721 is 1271041163.

3611401721 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2625127696 + 986274025 = 51236^2 + 31405^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3611401721 is a prime.

It is not a weakly prime, because it can be changed into another prime (3611401711) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1805700860 + 1805700861.

It is an arithmetic number, because the mean of its divisors is an integer number (1805700861).

Almost surely, 2^3611401721 is an apocalyptic number.

It is an amenable number.

3611401721 is a deficient number, since it is larger than the sum of its proper divisors (1).

3611401721 is an equidigital number, since it uses as much as digits as its factorization.

3611401721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1008, while the sum is 26.

The square root of 3611401721 is about 60094.9392295225. The cubic root of 3611401721 is about 1534.2351682135.

Adding to 3611401721 its reverse (1271041163), we get a palindrome (4882442884).

The spelling of 3611401721 in words is "three billion, six hundred eleven million, four hundred one thousand, seven hundred twenty-one".