999981743 has 2 divisors, whose sum is σ = 999981744. Its totient is φ = 999981742.

The previous prime is 999981739. The next prime is 999981781. The reversal of 999981743 is 347189999.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 999981743 - 2² = 999981739 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (999981713) 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, 499990871 + 499990872.

It is an arithmetic number, because the mean of its divisors is an integer number (499990872).

Almost surely, 2^999981743 is an apocalyptic number.

999981743 is a deficient number, since it is larger than the sum of its proper divisors (1).

999981743 is an equidigital number, since it uses as much as digits as its factorization.

999981743 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4408992, while the sum is 59.

The square root of 999981743 is about 31622.4879318500. The cubic root of 999981743 is about 999.9939142963.

The spelling of 999981743 in words is "nine hundred ninety-nine million, nine hundred eighty-one thousand, seven hundred forty-three".