3601537721 has 2 divisors, whose sum is σ = 3601537722. Its totient is φ = 3601537720.

The previous prime is 3601537699. The next prime is 3601537729. The reversal of 3601537721 is 1277351063.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1936000000 + 1665537721 = 44000^2 + 40811^2 .

It is a cyclic number.

It is not a de Polignac number, because 3601537721 - 2²⁶ = 3534428857 is a prime.

It is not a weakly prime, because it can be changed into another prime (3601537729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1800768860 + 1800768861.

It is an arithmetic number, because the mean of its divisors is an integer number (1800768861).

Almost surely, 2^3601537721 is an apocalyptic number.

It is an amenable number.

3601537721 is a deficient number, since it is larger than the sum of its proper divisors (1).

3601537721 is an equidigital number, since it uses as much as digits as its factorization.

3601537721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 26460, while the sum is 35.

The square root of 3601537721 is about 60012.8129735642. The cubic root of 3601537721 is about 1532.8370504109.

Adding to 3601537721 its reverse (1277351063), we get a palindrome (4878888784).

The spelling of 3601537721 in words is "three billion, six hundred one million, five hundred thirty-seven thousand, seven hundred twenty-one".