19287909110117 has 2 divisors, whose sum is σ = 19287909110118. Its totient is φ = 19287909110116.

The previous prime is 19287909110101. The next prime is 19287909110143. The reversal of 19287909110117 is 71101190978291.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14621989424641 + 4665919685476 = 3823871^2 + 2160074^2 .

It is a cyclic number.

It is not a de Polignac number, because 19287909110117 - 2⁴ = 19287909110101 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19287909110177) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9643954555058 + 9643954555059.

It is an arithmetic number, because the mean of its divisors is an integer number (9643954555059).

Almost surely, 2^{19287909110117} is an apocalyptic number.

It is an amenable number.

19287909110117 is a deficient number, since it is larger than the sum of its proper divisors (1).

19287909110117 is an equidigital number, since it uses as much as digits as its factorization.

19287909110117 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 571536, while the sum is 56.

The spelling of 19287909110117 in words is "nineteen trillion, two hundred eighty-seven billion, nine hundred nine million, one hundred ten thousand, one hundred seventeen".