919899999 has 12 divisors (see below), whose sum is σ = 1330581616. Its totient is φ = 612418752.

The previous prime is 919899979. The next prime is 919900001. The reversal of 919899999 is 999998919.

It is a happy number.

It is not a de Polignac number, because 919899999 - 2¹² = 919895903 is a prime.

It is a Duffinian number.

919899999 is a modest number, since divided by 99999 gives 9198 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (919899979) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 63754 + ... + 76839.

Almost surely, 2^919899999 is an apocalyptic number.

919899999 is a deficient number, since it is larger than the sum of its proper divisors (410681617).

919899999 is a wasteful number, since it uses less digits than its factorization.

919899999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141326 (or 141323 counting only the distinct ones).

The product of its digits is 38263752, while the sum is 72.

The square root of 919899999 is about 30329.8532637400. The cubic root of 919899999 is about 972.5535858640.

The spelling of 919899999 in words is "nine hundred nineteen million, eight hundred ninety-nine thousand, nine hundred ninety-nine".