19190648909 has 2 divisors, whose sum is σ = 19190648910. Its totient is φ = 19190648908.

The previous prime is 19190648881. The next prime is 19190648927. The reversal of 19190648909 is 90984609191.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10779007684 + 8411641225 = 103822^2 + 91715^2 .

It is a cyclic number.

It is not a de Polignac number, because 19190648909 - 2²⁴ = 19173871693 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19190648959) 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, 9595324454 + 9595324455.

It is an arithmetic number, because the mean of its divisors is an integer number (9595324455).

Almost surely, 2^19190648909 is an apocalyptic number.

It is an amenable number.

19190648909 is a deficient number, since it is larger than the sum of its proper divisors (1).

19190648909 is an equidigital number, since it uses as much as digits as its factorization.

19190648909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1259712, while the sum is 56.

The spelling of 19190648909 in words is "nineteen billion, one hundred ninety million, six hundred forty-eight thousand, nine hundred nine".