19128485309 has 2 divisors, whose sum is σ = 19128485310. Its totient is φ = 19128485308.

The previous prime is 19128485291. The next prime is 19128485381. The reversal of 19128485309 is 90358482191.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17957340025 + 1171145284 = 134005^2 + 34222^2 .

It is a cyclic number.

It is not a de Polignac number, because 19128485309 - 2⁸ = 19128485053 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19128485609) 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, 9564242654 + 9564242655.

It is an arithmetic number, because the mean of its divisors is an integer number (9564242655).

Almost surely, 2^19128485309 is an apocalyptic number.

It is an amenable number.

19128485309 is a deficient number, since it is larger than the sum of its proper divisors (1).

19128485309 is an equidigital number, since it uses as much as digits as its factorization.

19128485309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 622080, while the sum is 50.

The spelling of 19128485309 in words is "nineteen billion, one hundred twenty-eight million, four hundred eighty-five thousand, three hundred nine".