1109121680 has 20 divisors (see below), whose sum is σ = 2578708092. Its totient is φ = 443648640.

The previous prime is 1109121677. The next prime is 1109121683. The reversal of 1109121680 is 861219011.

It is an interprime number because it is at equal distance from previous prime (1109121677) and next prime (1109121683).

It can be written as a sum of positive squares in 2 ways, for example, as 820937104 + 288184576 = 28652^2 + 16976^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is not an unprimeable number, because it can be changed into a prime (1109121683) 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 3 ways as a sum of consecutive naturals, for example, 6931931 + ... + 6932090.

Almost surely, 2^1109121680 is an apocalyptic number.

1109121680 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1109121680 is an abundant number, since it is smaller than the sum of its proper divisors (1469586412).

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

1109121680 is a wasteful number, since it uses less digits than its factorization.

1109121680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13864034 (or 13864028 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 29.

The square root of 1109121680 is about 33303.4784969979. The cubic root of 1109121680 is about 1035.1256368447.

The spelling of 1109121680 in words is "one billion, one hundred nine million, one hundred twenty-one thousand, six hundred eighty".