9999122171 has 2 divisors, whose sum is σ = 9999122172. Its totient is φ = 9999122170.

The previous prime is 9999122149. The next prime is 9999122227. The reversal of 9999122171 is 1712219999.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 9999122171 - 2²² = 9994927867 is a prime.

It is not a weakly prime, because it can be changed into another prime (9999122131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4999561085 + 4999561086.

It is an arithmetic number, because the mean of its divisors is an integer number (4999561086).

Almost surely, 2^9999122171 is an apocalyptic number.

9999122171 is a deficient number, since it is larger than the sum of its proper divisors (1).

9999122171 is an equidigital number, since it uses as much as digits as its factorization.

9999122171 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 183708, while the sum is 50.

The square root of 9999122171 is about 99995.6107586728. The cubic root of 9999122171 is about 2154.3716473455.

The spelling of 9999122171 in words is "nine billion, nine hundred ninety-nine million, one hundred twenty-two thousand, one hundred seventy-one".