3965321609 has 2 divisors, whose sum is σ = 3965321610. Its totient is φ = 3965321608.

The previous prime is 3965321551. The next prime is 3965321627. The reversal of 3965321609 is 9061235693.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2629638400 + 1335683209 = 51280^2 + 36547^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3965321609 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 3965321609.

It is not a weakly prime, because it can be changed into another prime (3965321639) 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, 1982660804 + 1982660805.

It is an arithmetic number, because the mean of its divisors is an integer number (1982660805).

Almost surely, 2^3965321609 is an apocalyptic number.

It is an amenable number.

3965321609 is a deficient number, since it is larger than the sum of its proper divisors (1).

3965321609 is an equidigital number, since it uses as much as digits as its factorization.

3965321609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 262440, while the sum is 44.

The square root of 3965321609 is about 62970.7996534902. The cubic root of 3965321609 is about 1582.8003546474.

The spelling of 3965321609 in words is "three billion, nine hundred sixty-five million, three hundred twenty-one thousand, six hundred nine".