19117398887 has 2 divisors, whose sum is σ = 19117398888. Its totient is φ = 19117398886.

The previous prime is 19117398871. The next prime is 19117398901. The reversal of 19117398887 is 78889371191.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 19117398887 - 2⁴ = 19117398871 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19117398827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9558699443 + 9558699444.

It is an arithmetic number, because the mean of its divisors is an integer number (9558699444).

Almost surely, 2^19117398887 is an apocalyptic number.

19117398887 is a deficient number, since it is larger than the sum of its proper divisors (1).

19117398887 is an equidigital number, since it uses as much as digits as its factorization.

19117398887 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6096384, while the sum is 62.

The spelling of 19117398887 in words is "nineteen billion, one hundred seventeen million, three hundred ninety-eight thousand, eight hundred eighty-seven".