999099090 has 64 divisors (see below), whose sum is σ = 2906478720. Its totient is φ = 242205120.

The previous prime is 999099089. The next prime is 999099091. The reversal of 999099090 is 90990999.

999099090 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (999099089) and next prime (999099091).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (999099091) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 165229 + ... + 171168.

It is an arithmetic number, because the mean of its divisors is an integer number (45413730).

Almost surely, 2^999099090 is an apocalyptic number.

999099090 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

999099090 is an abundant number, since it is smaller than the sum of its proper divisors (1907379630).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

999099090 is a wasteful number, since it uses less digits than its factorization.

999099090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 336424 (or 336418 counting only the distinct ones).

The product of its (nonzero) digits is 531441, while the sum is 54.

The square root of 999099090 is about 31608.5287541195. The cubic root of 999099090 is about 999.6996064394.

It can be divided in two parts, 9 and 99099090, that added together give a palindrome (99099099).

The spelling of 999099090 in words is "nine hundred ninety-nine million, ninety-nine thousand, ninety".