19899984289 has 2 divisors, whose sum is σ = 19899984290. Its totient is φ = 19899984288.

The previous prime is 19899984277. The next prime is 19899984331. The reversal of 19899984289 is 98248999891.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11926387264 + 7973597025 = 109208^2 + 89295^2 .

It is a cyclic number.

It is not a de Polignac number, because 19899984289 - 2¹⁹ = 19899460001 is a prime.

It is not a weakly prime, because it can be changed into another prime (19899984239) 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, 9949992144 + 9949992145.

It is an arithmetic number, because the mean of its divisors is an integer number (9949992145).

Almost surely, 2^19899984289 is an apocalyptic number.

It is an amenable number.

19899984289 is a deficient number, since it is larger than the sum of its proper divisors (1).

19899984289 is an equidigital number, since it uses as much as digits as its factorization.

19899984289 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 241864704, while the sum is 76.

The spelling of 19899984289 in words is "nineteen billion, eight hundred ninety-nine million, nine hundred eighty-four thousand, two hundred eighty-nine".