19900000019 has 2 divisors, whose sum is σ = 19900000020. Its totient is φ = 19900000018.

The previous prime is 19899999997. The next prime is 19900000031. The reversal of 19900000019 is 91000000991.

It is a strong prime.

It is an emirp because it is prime and its reverse (91000000991) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 19900000019 - 2¹² = 19899995923 is a prime.

It is a super-2 number, since 2×19900000019² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 19899999937 and 19900000000.

It is not a weakly prime, because it can be changed into another prime (19900000069) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9950000009 + 9950000010.

It is an arithmetic number, because the mean of its divisors is an integer number (9950000010).

Almost surely, 2^19900000019 is an apocalyptic number.

19900000019 is a deficient number, since it is larger than the sum of its proper divisors (1).

19900000019 is an equidigital number, since it uses as much as digits as its factorization.

19900000019 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 729, while the sum is 29.

The spelling of 19900000019 in words is "nineteen billion, nine hundred million, nineteen", and thus it is an aban number.