18128109191 has 2 divisors, whose sum is σ = 18128109192. Its totient is φ = 18128109190.

The previous prime is 18128109143. The next prime is 18128109193. The reversal of 18128109191 is 19190182181.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18128109191 - 2⁶ = 18128109127 is a prime.

Together with 18128109193, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18128109193) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9064054595 + 9064054596.

It is an arithmetic number, because the mean of its divisors is an integer number (9064054596).

Almost surely, 2^18128109191 is an apocalyptic number.

18128109191 is a deficient number, since it is larger than the sum of its proper divisors (1).

18128109191 is an equidigital number, since it uses as much as digits as its factorization.

18128109191 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10368, while the sum is 41.

The spelling of 18128109191 in words is "eighteen billion, one hundred twenty-eight million, one hundred nine thousand, one hundred ninety-one".