19208478139 has 2 divisors, whose sum is σ = 19208478140. Its totient is φ = 19208478138.

The previous prime is 19208478131. The next prime is 19208478161. The reversal of 19208478139 is 93187480291.

It is a weak prime.

It is an emirp because it is prime and its reverse (93187480291) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 19208478139 - 2³ = 19208478131 is a prime.

It is not a weakly prime, because it can be changed into another prime (19208478131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9604239069 + 9604239070.

It is an arithmetic number, because the mean of its divisors is an integer number (9604239070).

Almost surely, 2^19208478139 is an apocalyptic number.

19208478139 is a deficient number, since it is larger than the sum of its proper divisors (1).

19208478139 is an equidigital number, since it uses as much as digits as its factorization.

19208478139 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 870912, while the sum is 52.

The spelling of 19208478139 in words is "nineteen billion, two hundred eight million, four hundred seventy-eight thousand, one hundred thirty-nine".