990899999 has 2 divisors, whose sum is σ = 990900000. Its totient is φ = 990899998.

The previous prime is 990899993. The next prime is 990900019. The reversal of 990899999 is 999998099.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 990899999 - 2⁸ = 990899743 is a prime.

990899999 is a modest number, since divided by 99999 gives 9908 as remainder.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (990899993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 495449999 + 495450000.

It is an arithmetic number, because the mean of its divisors is an integer number (495450000).

Almost surely, 2^990899999 is an apocalyptic number.

990899999 is a deficient number, since it is larger than the sum of its proper divisors (1).

990899999 is an equidigital number, since it uses as much as digits as its factorization.

990899999 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 990899999 is about 31478.5641190954. The cubic root of 990899999 is about 996.9574184194.

The spelling of 990899999 in words is "nine hundred ninety million, eight hundred ninety-nine thousand, nine hundred ninety-nine".