1109145280 has 112 divisors (see below), whose sum is σ = 2887163136. Its totient is φ = 404029440.

The previous prime is 1109145259. The next prime is 1109145299. The reversal of 1109145280 is 825419011.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 165352 + ... + 171928.

Almost surely, 2^1109145280 is an apocalyptic number.

1109145280 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1109145280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1443581568).

1109145280 is an abundant number, since it is smaller than the sum of its proper divisors (1778017856).

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

1109145280 is a wasteful number, since it uses less digits than its factorization.

1109145280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6642 (or 6632 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 31.

The square root of 1109145280 is about 33303.8328124557. The cubic root of 1109145280 is about 1035.1329786276.

The spelling of 1109145280 in words is "one billion, one hundred nine million, one hundred forty-five thousand, two hundred eighty".