19328509 has 2 divisors, whose sum is σ = 19328510. Its totient is φ = 19328508.

The previous prime is 19328501. The next prime is 19328527. The reversal of 19328509 is 90582391.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9903609 + 9424900 = 3147^2 + 3070^2 .

It is a cyclic number.

It is not a de Polignac number, because 19328509 - 2³ = 19328501 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19328501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9664254 + 9664255.

It is an arithmetic number, because the mean of its divisors is an integer number (9664255).

Almost surely, 2^19328509 is an apocalyptic number.

It is an amenable number.

19328509 is a deficient number, since it is larger than the sum of its proper divisors (1).

19328509 is an equidigital number, since it uses as much as digits as its factorization.

19328509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 19440, while the sum is 37.

The square root of 19328509 is about 4396.4200208806. The cubic root of 19328509 is about 268.3692698635.

The spelling of 19328509 in words is "nineteen million, three hundred twenty-eight thousand, five hundred nine".