999931199 has 2 divisors, whose sum is σ = 999931200. Its totient is φ = 999931198.

The previous prime is 999931171. The next prime is 999931201. The reversal of 999931199 is 991139999.

It is a strong prime.

It is an emirp because it is prime and its reverse (991139999) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-999931199 is a prime.

It is a Sophie Germain prime.

Together with 999931201, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (999931139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499965599 + 499965600.

It is an arithmetic number, because the mean of its divisors is an integer number (499965600).

Almost surely, 2^999931199 is an apocalyptic number.

999931199 is a deficient number, since it is larger than the sum of its proper divisors (1).

999931199 is an equidigital number, since it uses as much as digits as its factorization.

999931199 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1594323, while the sum is 59.

The square root of 999931199 is about 31621.6887436456. The cubic root of 999931199 is about 999.9770658074.

The spelling of 999931199 in words is "nine hundred ninety-nine million, nine hundred thirty-one thousand, one hundred ninety-nine".