19309243819 has 2 divisors, whose sum is σ = 19309243820. Its totient is φ = 19309243818.

The previous prime is 19309243817. The next prime is 19309243853. The reversal of 19309243819 is 91834290391.

It is a weak prime.

It is an emirp because it is prime and its reverse (91834290391) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 19309243819 - 2¹ = 19309243817 is a prime.

It is a super-2 number, since 2×19309243819² (a number of 21 digits) contains 22 as substring.

Together with 19309243817, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (19309243817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9654621909 + 9654621910.

It is an arithmetic number, because the mean of its divisors is an integer number (9654621910).

Almost surely, 2^19309243819 is an apocalyptic number.

19309243819 is a deficient number, since it is larger than the sum of its proper divisors (1).

19309243819 is an equidigital number, since it uses as much as digits as its factorization.

19309243819 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 419904, while the sum is 49.

The spelling of 19309243819 in words is "nineteen billion, three hundred nine million, two hundred forty-three thousand, eight hundred nineteen".