19349924857 has 2 divisors, whose sum is σ = 19349924858. Its totient is φ = 19349924856.

The previous prime is 19349924831. The next prime is 19349924887. The reversal of 19349924857 is 75842994391.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18426433536 + 923491321 = 135744^2 + 30389^2 .

It is an emirp because it is prime and its reverse (75842994391) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19349924857 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 19349924795 and 19349924804.

It is not a weakly prime, because it can be changed into another prime (19349924827) 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, 9674962428 + 9674962429.

It is an arithmetic number, because the mean of its divisors is an integer number (9674962429).

Almost surely, 2^19349924857 is an apocalyptic number.

It is an amenable number.

19349924857 is a deficient number, since it is larger than the sum of its proper divisors (1).

19349924857 is an equidigital number, since it uses as much as digits as its factorization.

19349924857 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 19595520, while the sum is 61.

The spelling of 19349924857 in words is "nineteen billion, three hundred forty-nine million, nine hundred twenty-four thousand, eight hundred fifty-seven".