999931099 has 2 divisors, whose sum is σ = 999931100. Its totient is φ = 999931098.

The previous prime is 999931091. The next prime is 999931139. The reversal of 999931099 is 990139999.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 999931099 - 2³ = 999931091 is a prime.

It is not a weakly prime, because it can be changed into another prime (999931091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499965549 + 499965550.

It is an arithmetic number, because the mean of its divisors is an integer number (499965550).

Almost surely, 2^999931099 is an apocalyptic number.

999931099 is a deficient number, since it is larger than the sum of its proper divisors (1).

999931099 is an equidigital number, since it uses as much as digits as its factorization.

999931099 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1594323, while the sum is 58.

The square root of 999931099 is about 31621.6871624523. The cubic root of 999931099 is about 999.9770324725.

The spelling of 999931099 in words is "nine hundred ninety-nine million, nine hundred thirty-one thousand, ninety-nine".