1109121678 has 24 divisors (see below), whose sum is σ = 2746396848. Its totient is φ = 316891872.

The previous prime is 1109121677. The next prime is 1109121683. The reversal of 1109121678 is 8761219011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1109121677) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4401151 + ... + 4401402.

It is an arithmetic number, because the mean of its divisors is an integer number (114433202).

Almost surely, 2^1109121678 is an apocalyptic number.

1109121678 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1109121678 is an abundant number, since it is smaller than the sum of its proper divisors (1637275170).

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

1109121678 is a wasteful number, since it uses less digits than its factorization.

1109121678 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8802568 (or 8802565 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 36.

The square root of 1109121678 is about 33303.4784669710. The cubic root of 1109121678 is about 1035.1256362225.

The spelling of 1109121678 in words is "one billion, one hundred nine million, one hundred twenty-one thousand, six hundred seventy-eight".