999998881171 has 2 divisors, whose sum is σ = 999998881172. Its totient is φ = 999998881170.

The previous prime is 999998881169. The next prime is 999998881177. The reversal of 999998881171 is 171188899999.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 999998881171 - 2¹ = 999998881169 is a prime.

Together with 999998881169, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 999998881091 and 999998881100.

It is not a weakly prime, because it can be changed into another prime (999998881177) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499999440585 + 499999440586.

It is an arithmetic number, because the mean of its divisors is an integer number (499999440586).

Almost surely, 2^999998881171 is an apocalyptic number.

999998881171 is a deficient number, since it is larger than the sum of its proper divisors (1).

999998881171 is an equidigital number, since it uses as much as digits as its factorization.

999998881171 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 211631616, while the sum is 79.

The spelling of 999998881171 in words is "nine hundred ninety-nine billion, nine hundred ninety-eight million, eight hundred eighty-one thousand, one hundred seventy-one".