1109145281 has 6 divisors (see below), whose sum is σ = 1148711382. Its totient is φ = 1070898080.

The previous prime is 1109145259. The next prime is 1109145299. The reversal of 1109145281 is 1825419011.

It can be written as a sum of positive squares in 3 ways, for example, as 210105025 + 899040256 = 14495^2 + 29984^2 .

It is a de Polignac number, because none of the positive numbers 2^k-1109145281 is a prime.

It is a super-2 number, since 2×1109145281² = 2460406508729137922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1109145251) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 658580 + ... + 660261.

It is an arithmetic number, because the mean of its divisors is an integer number (191451897).

Almost surely, 2^1109145281 is an apocalyptic number.

It is an amenable number.

1109145281 is a deficient number, since it is larger than the sum of its proper divisors (39566101).

1109145281 is an equidigital number, since it uses as much as digits as its factorization.

1109145281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1318899 (or 1318870 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 32.

The square root of 1109145281 is about 33303.8328274690. The cubic root of 1109145281 is about 1035.1329789387.

The spelling of 1109145281 in words is "one billion, one hundred nine million, one hundred forty-five thousand, two hundred eighty-one".