999998143 has 2 divisors, whose sum is σ = 999998144. Its totient is φ = 999998142.

The previous prime is 999998141. The next prime is 999998147. The reversal of 999998143 is 341899999.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 999998143 - 2¹ = 999998141 is a prime.

Together with 999998141, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (999998141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499999071 + 499999072.

It is an arithmetic number, because the mean of its divisors is an integer number (499999072).

Almost surely, 2^999998143 is an apocalyptic number.

999998143 is a deficient number, since it is larger than the sum of its proper divisors (1).

999998143 is an equidigital number, since it uses as much as digits as its factorization.

999998143 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5668704, while the sum is 61.

The square root of 999998143 is about 31622.7472399221. The cubic root of 999998143 is about 999.9993809996. Note that the first 3 decimals are identical.

The spelling of 999998143 in words is "nine hundred ninety-nine million, nine hundred ninety-eight thousand, one hundred forty-three".