999917207 has 2 divisors, whose sum is σ = 999917208. Its totient is φ = 999917206.

The previous prime is 999917189. The next prime is 999917213. The reversal of 999917207 is 702719999.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-999917207 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 (999917257) 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, 499958603 + 499958604.

It is an arithmetic number, because the mean of its divisors is an integer number (499958604).

Almost surely, 2^999917207 is an apocalyptic number.

999917207 is a deficient number, since it is larger than the sum of its proper divisors (1).

999917207 is an equidigital number, since it uses as much as digits as its factorization.

999917207 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 642978, while the sum is 53.

The square root of 999917207 is about 31621.4675023156. The cubic root of 999917207 is about 999.9724015717.

The spelling of 999917207 in words is "nine hundred ninety-nine million, nine hundred seventeen thousand, two hundred seven".