999931171 has 2 divisors, whose sum is σ = 999931172. Its totient is φ = 999931170.

The previous prime is 999931139. The next prime is 999931199. The reversal of 999931171 is 171139999.

It is a strong prime.

It is an emirp because it is prime and its reverse (171139999) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 999931171 - 2⁵ = 999931139 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (999935171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499965585 + 499965586.

It is an arithmetic number, because the mean of its divisors is an integer number (499965586).

Almost surely, 2^999931171 is an apocalyptic number.

999931171 is a deficient number, since it is larger than the sum of its proper divisors (1).

999931171 is an equidigital number, since it uses as much as digits as its factorization.

999931171 is an evil number, because the sum of its binary digits is even.

The product of its digits is 137781, while the sum is 49.

The square root of 999931171 is about 31621.6883009114. The cubic root of 999931171 is about 999.9770564736.

The spelling of 999931171 in words is "nine hundred ninety-nine million, nine hundred thirty-one thousand, one hundred seventy-one".