999998243 has 2 divisors, whose sum is σ = 999998244. Its totient is φ = 999998242.

The previous prime is 999998203. The next prime is 999998261. The reversal of 999998243 is 342899999.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-999998243 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (999998203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499999121 + 499999122.

It is an arithmetic number, because the mean of its divisors is an integer number (499999122).

Almost surely, 2^999998243 is an apocalyptic number.

999998243 is a deficient number, since it is larger than the sum of its proper divisors (1).

999998243 is an equidigital number, since it uses as much as digits as its factorization.

999998243 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11337408, while the sum is 62.

The square root of 999998243 is about 31622.7488210623. The cubic root of 999998243 is about 999.9994143330. Note that the first 3 decimals are identical.

The spelling of 999998243 in words is "nine hundred ninety-nine million, nine hundred ninety-eight thousand, two hundred forty-three".