1109181920 has 96 divisors (see below), whose sum is σ = 3267081216. Its totient is φ = 345715200.

The previous prime is 1109181919. The next prime is 1109181961. The reversal of 1109181920 is 291819011.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32696 + ... + 57335.

It is an arithmetic number, because the mean of its divisors is an integer number (34032096).

Almost surely, 2^1109181920 is an apocalyptic number.

1109181920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1109181920 is an abundant number, since it is smaller than the sum of its proper divisors (2157899296).

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

1109181920 is a wasteful number, since it uses less digits than its factorization.

1109181920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90064 (or 90056 counting only the distinct ones).

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

The square root of 1109181920 is about 33304.3828947483. The cubic root of 1109181920 is about 1035.1443768503.

The spelling of 1109181920 in words is "one billion, one hundred nine million, one hundred eighty-one thousand, nine hundred twenty".