1998512143 has 2 divisors, whose sum is σ = 1998512144. Its totient is φ = 1998512142.

The previous prime is 1998512141. The next prime is 1998512171. The reversal of 1998512143 is 3412158991.

It is a weak prime.

It is an emirp because it is prime and its reverse (3412158991) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1998512143 - 2¹ = 1998512141 is a prime.

Together with 1998512141, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 1998512143.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1998512141) 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, 999256071 + 999256072.

It is an arithmetic number, because the mean of its divisors is an integer number (999256072).

Almost surely, 2^1998512143 is an apocalyptic number.

1998512143 is a deficient number, since it is larger than the sum of its proper divisors (1).

1998512143 is an equidigital number, since it uses as much as digits as its factorization.

1998512143 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 77760, while the sum is 43.

The square root of 1998512143 is about 44704.7217081149. The cubic root of 1998512143 is about 1259.6085419953.

The spelling of 1998512143 in words is "one billion, nine hundred ninety-eight million, five hundred twelve thousand, one hundred forty-three".