3645437909 has 2 divisors, whose sum is σ = 3645437910. Its totient is φ = 3645437908.

The previous prime is 3645437899. The next prime is 3645437981. The reversal of 3645437909 is 9097345463.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3060523684 + 584914225 = 55322^2 + 24185^2 .

It is an emirp because it is prime and its reverse (9097345463) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3645437909 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3645437009) 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, 1822718954 + 1822718955.

It is an arithmetic number, because the mean of its divisors is an integer number (1822718955).

Almost surely, 2^3645437909 is an apocalyptic number.

It is an amenable number.

3645437909 is a deficient number, since it is larger than the sum of its proper divisors (1).

3645437909 is an equidigital number, since it uses as much as digits as its factorization.

3645437909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2449440, while the sum is 50.

The square root of 3645437909 is about 60377.4619291007. The cubic root of 3645437909 is about 1539.0399803112.

The spelling of 3645437909 in words is "three billion, six hundred forty-five million, four hundred thirty-seven thousand, nine hundred nine".