1109191820 has 48 divisors (see below), whose sum is σ = 2576883456. Its totient is φ = 397656000.

The previous prime is 1109191793. The next prime is 1109191829. The reversal of 1109191820 is 281919011.

It is not an unprimeable number, because it can be changed into a prime (1109191829) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19886 + ... + 51125.

It is an arithmetic number, because the mean of its divisors is an integer number (53685072).

Almost surely, 2^1109191820 is an apocalyptic number.

1109191820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1109191820 is an abundant number, since it is smaller than the sum of its proper divisors (1467691636).

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

1109191820 is a wasteful number, since it uses less digits than its factorization.

1109191820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71102 (or 71100 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 32.

The square root of 1109191820 is about 33304.5315235029. The cubic root of 1109191820 is about 1035.1474565671.

The spelling of 1109191820 in words is "one billion, one hundred nine million, one hundred ninety-one thousand, eight hundred twenty".