999694217 has 2 divisors, whose sum is σ = 999694218. Its totient is φ = 999694216.

The previous prime is 999694187. The next prime is 999694273. The reversal of 999694217 is 712496999.

It is an a-pointer prime, because the next prime (999694273) can be obtained adding 999694217 to its sum of digits (56).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 522533881 + 477160336 = 22859^2 + 21844^2 .

It is a cyclic number.

It is not a de Polignac number, because 999694217 - 2¹⁸ = 999432073 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (999694117) 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, 499847108 + 499847109.

It is an arithmetic number, because the mean of its divisors is an integer number (499847109).

Almost surely, 2^999694217 is an apocalyptic number.

It is an amenable number.

999694217 is a deficient number, since it is larger than the sum of its proper divisors (1).

999694217 is an equidigital number, since it uses as much as digits as its factorization.

999694217 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2204496, while the sum is 56.

The square root of 999694217 is about 31617.9413782745. The cubic root of 999694217 is about 999.8980619423.

The spelling of 999694217 in words is "nine hundred ninety-nine million, six hundred ninety-four thousand, two hundred seventeen".