999985247 has 2 divisors, whose sum is σ = 999985248. Its totient is φ = 999985246.

The previous prime is 999985243. The next prime is 999985249. The reversal of 999985247 is 742589999.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 999985247 - 2² = 999985243 is a prime.

Together with 999985249, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 999985247.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (999985243) 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, 499992623 + 499992624.

It is an arithmetic number, because the mean of its divisors is an integer number (499992624).

Almost surely, 2^999985247 is an apocalyptic number.

999985247 is a deficient number, since it is larger than the sum of its proper divisors (1).

999985247 is an equidigital number, since it uses as much as digits as its factorization.

999985247 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 14696640, while the sum is 62.

The square root of 999985247 is about 31622.5433354118. The cubic root of 999985247 is about 999.9950823091.

The spelling of 999985247 in words is "nine hundred ninety-nine million, nine hundred eighty-five thousand, two hundred forty-seven".