1109891712 has 64 divisors (see below), whose sum is σ = 3049840800. Its totient is φ = 357202944.

The previous prime is 1109891681. The next prime is 1109891719. The reversal of 1109891712 is 2171989011.

It is a tau number, because it is divible by the number of its divisors (64).

It is a super-2 number, since 2×1109891712² = 2463719224732581888, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1109891719) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 38698 + ... + 60969.

Almost surely, 2^1109891712 is an apocalyptic number.

1109891712 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1109891712 is an abundant number, since it is smaller than the sum of its proper divisors (1939949088).

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

1109891712 is an equidigital number, since it uses as much as digits as its factorization.

1109891712 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99713 (or 99701 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 39.

The square root of 1109891712 is about 33315.0373255081. The cubic root of 1109891712 is about 1035.3651343036.

The spelling of 1109891712 in words is "one billion, one hundred nine million, eight hundred ninety-one thousand, seven hundred twelve".