1445409809 has 2 divisors, whose sum is σ = 1445409810. Its totient is φ = 1445409808.

The previous prime is 1445409787. The next prime is 1445409829. The reversal of 1445409809 is 9089045441.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1376187409 + 69222400 = 37097^2 + 8320^2 .

It is a cyclic number.

It is not a de Polignac number, because 1445409809 - 2²⁸ = 1176974353 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1445409809.

It is not a weakly prime, because it can be changed into another prime (1445409829) 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, 722704904 + 722704905.

It is an arithmetic number, because the mean of its divisors is an integer number (722704905).

Almost surely, 2^1445409809 is an apocalyptic number.

It is an amenable number.

1445409809 is a deficient number, since it is larger than the sum of its proper divisors (1).

1445409809 is an equidigital number, since it uses as much as digits as its factorization.

1445409809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 207360, while the sum is 44.

The square root of 1445409809 is about 38018.5455929077. The cubic root of 1445409809 is about 1130.6555855906.

The spelling of 1445409809 in words is "one billion, four hundred forty-five million, four hundred nine thousand, eight hundred nine".