18998121119 has 2 divisors, whose sum is σ = 18998121120. Its totient is φ = 18998121118.

The previous prime is 18998121097. The next prime is 18998121167. The reversal of 18998121119 is 91112189981.

It is a weak prime.

It is an emirp because it is prime and its reverse (91112189981) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18998121119 is a prime.

It is a super-2 number, since 2×18998121119² (a number of 21 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18998121019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9499060559 + 9499060560.

It is an arithmetic number, because the mean of its divisors is an integer number (9499060560).

Almost surely, 2^18998121119 is an apocalyptic number.

18998121119 is a deficient number, since it is larger than the sum of its proper divisors (1).

18998121119 is an equidigital number, since it uses as much as digits as its factorization.

18998121119 is an evil number, because the sum of its binary digits is even.

The product of its digits is 93312, while the sum is 50.

The spelling of 18998121119 in words is "eighteen billion, nine hundred ninety-eight million, one hundred twenty-one thousand, one hundred nineteen".