999899099 has 2 divisors, whose sum is σ = 999899100. Its totient is φ = 999899098.

The previous prime is 999899077. The next prime is 999899101. The reversal of 999899099 is 990998999.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-999899099 is a prime.

Together with 999899101, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (999899039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499949549 + 499949550.

It is an arithmetic number, because the mean of its divisors is an integer number (499949550).

Almost surely, 2^999899099 is an apocalyptic number.

999899099 is a deficient number, since it is larger than the sum of its proper divisors (1).

999899099 is an equidigital number, since it uses as much as digits as its factorization.

999899099 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 38263752, while the sum is 71.

The square root of 999899099 is about 31621.1811765468. The cubic root of 999899099 is about 999.9663652020.

The spelling of 999899099 in words is "nine hundred ninety-nine million, eight hundred ninety-nine thousand, ninety-nine".