19115078387 has 2 divisors, whose sum is σ = 19115078388. Its totient is φ = 19115078386.

The previous prime is 19115078317. The next prime is 19115078419. The reversal of 19115078387 is 78387051191.

It is a strong prime.

It is an emirp because it is prime and its reverse (78387051191) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 19115078387 - 2¹⁰ = 19115077363 is a prime.

It is not a weakly prime, because it can be changed into another prime (19115078317) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9557539193 + 9557539194.

It is an arithmetic number, because the mean of its divisors is an integer number (9557539194).

Almost surely, 2^19115078387 is an apocalyptic number.

19115078387 is a deficient number, since it is larger than the sum of its proper divisors (1).

19115078387 is an equidigital number, since it uses as much as digits as its factorization.

19115078387 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 423360, while the sum is 50.

The spelling of 19115078387 in words is "nineteen billion, one hundred fifteen million, seventy-eight thousand, three hundred eighty-seven".