999968279 has 2 divisors, whose sum is σ = 999968280. Its totient is φ = 999968278.

The previous prime is 999968269. The next prime is 999968297. The reversal of 999968279 is 972869999.

Together with next prime (999968297) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-999968279 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (999968269) 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, 499984139 + 499984140.

It is an arithmetic number, because the mean of its divisors is an integer number (499984140).

Almost surely, 2^999968279 is an apocalyptic number.

999968279 is a deficient number, since it is larger than the sum of its proper divisors (1).

999968279 is an equidigital number, since it uses as much as digits as its factorization.

999968279 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 39680928, while the sum is 68.

The square root of 999968279 is about 31622.2750446580. The cubic root of 999968279 is about 999.9894262215.

The spelling of 999968279 in words is "nine hundred ninety-nine million, nine hundred sixty-eight thousand, two hundred seventy-nine".