999212999 has 2 divisors, whose sum is σ = 999213000. Its totient is φ = 999212998.

The previous prime is 999212971. The next prime is 999213011.

999212999 is nontrivially palindromic in base 10.

It is a strong prime.

It is a palprime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-999212999 is a prime.

It is a Sophie Germain 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 (999212699) 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, 499606499 + 499606500.

It is an arithmetic number, because the mean of its divisors is an integer number (499606500).

Almost surely, 2^999212999 is an apocalyptic number.

999212999 is a deficient number, since it is larger than the sum of its proper divisors (1).

999212999 is an equidigital number, since it uses as much as digits as its factorization.

999212999 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2125764, while the sum is 59.

The square root of 999212999 is about 31610.3305740386. The cubic root of 999212999 is about 999.7375974843.

The spelling of 999212999 in words is "nine hundred ninety-nine million, two hundred twelve thousand, nine hundred ninety-nine".