1099999012 has 48 divisors (see below), whose sum is σ = 2319448320. Its totient is φ = 446257152.

The previous prime is 1099998997. The next prime is 1099999037. The reversal of 1099999012 is 2109999901.

It is a super-2 number, since 2×1099999012² = 2419995652801952288, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 53664 + ... + 71272.

It is an arithmetic number, because the mean of its divisors is an integer number (48321840).

Almost surely, 2^1099999012 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1099999012, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1159724160).

1099999012 is an abundant number, since it is smaller than the sum of its proper divisors (1219449308).

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

1099999012 is a wasteful number, since it uses less digits than its factorization.

1099999012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17740 (or 17738 counting only the distinct ones).

The product of its (nonzero) digits is 118098, while the sum is 49.

The square root of 1099999012 is about 33166.2330088902. The cubic root of 1099999012 is about 1032.2798063979.

It can be divided in two parts, 10999 and 99012, that added together give a palindrome (110011).

The spelling of 1099999012 in words is "one billion, ninety-nine million, nine hundred ninety-nine thousand, twelve".