3609870721 has 2 divisors, whose sum is σ = 3609870722. Its totient is φ = 3609870720.

The previous prime is 3609870653. The next prime is 3609870731. The reversal of 3609870721 is 1270789063.

It is a happy number.

3609870721 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3079029121 + 530841600 = 55489^2 + 23040^2 .

It is a cyclic number.

It is not a de Polignac number, because 3609870721 - 2¹¹ = 3609868673 is a prime.

It is not a weakly prime, because it can be changed into another prime (3609870731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1804935360 + 1804935361.

It is an arithmetic number, because the mean of its divisors is an integer number (1804935361).

Almost surely, 2^3609870721 is an apocalyptic number.

It is an amenable number.

3609870721 is a deficient number, since it is larger than the sum of its proper divisors (1).

3609870721 is an equidigital number, since it uses as much as digits as its factorization.

3609870721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 127008, while the sum is 43.

The square root of 3609870721 is about 60082.1997017419. The cubic root of 3609870721 is about 1534.0183321822.

The spelling of 3609870721 in words is "three billion, six hundred nine million, eight hundred seventy thousand, seven hundred twenty-one".