19109803117 has 2 divisors, whose sum is σ = 19109803118. Its totient is φ = 19109803116.

The previous prime is 19109803081. The next prime is 19109803127. The reversal of 19109803117 is 71130890191.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18792571396 + 317231721 = 137086^2 + 17811^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19109803117 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 19109803117.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19109803127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9554901558 + 9554901559.

It is an arithmetic number, because the mean of its divisors is an integer number (9554901559).

Almost surely, 2^19109803117 is an apocalyptic number.

It is an amenable number.

19109803117 is a deficient number, since it is larger than the sum of its proper divisors (1).

19109803117 is an equidigital number, since it uses as much as digits as its factorization.

19109803117 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13608, while the sum is 40.

The spelling of 19109803117 in words is "nineteen billion, one hundred nine million, eight hundred three thousand, one hundred seventeen".