999968143 has 2 divisors, whose sum is σ = 999968144. Its totient is φ = 999968142.

The previous prime is 999968131. The next prime is 999968149. The reversal of 999968143 is 341869999.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-999968143 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (999968149) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499984071 + 499984072.

It is an arithmetic number, because the mean of its divisors is an integer number (499984072).

Almost surely, 2^999968143 is an apocalyptic number.

999968143 is a deficient number, since it is larger than the sum of its proper divisors (1).

999968143 is an equidigital number, since it uses as much as digits as its factorization.

999968143 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3779136, while the sum is 58.

The square root of 999968143 is about 31622.2728942750. The cubic root of 999968143 is about 999.9893808872.

The spelling of 999968143 in words is "nine hundred ninety-nine million, nine hundred sixty-eight thousand, one hundred forty-three".