999999999247 has 2 divisors, whose sum is σ = 999999999248. Its totient is φ = 999999999246.

The previous prime is 999999999161. The next prime is 999999999253. The reversal of 999999999247 is 742999999999.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-999999999247 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (999999999277) 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, 499999999623 + 499999999624.

It is an arithmetic number, because the mean of its divisors is an integer number (499999999624).

Almost surely, 2^999999999247 is an apocalyptic number.

999999999247 is a deficient number, since it is larger than the sum of its proper divisors (1).

999999999247 is an equidigital number, since it uses as much as digits as its factorization.

999999999247 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 21695547384, while the sum is 94.

The spelling of 999999999247 in words is "nine hundred ninety-nine billion, nine hundred ninety-nine million, nine hundred ninety-nine thousand, two hundred forty-seven".