1109128745 has 8 divisors (see below), whose sum is σ = 1332477384. Its totient is φ = 886287744.

The previous prime is 1109128729. The next prime is 1109128763. The reversal of 1109128745 is 5478219011.

It can be written as a sum of positive squares in 4 ways, for example, as 587965504 + 521163241 = 24248^2 + 22829^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1109128745 - 2⁴ = 1109128729 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1109128699 and 1109128708.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 122084 + ... + 130853.

It is an arithmetic number, because the mean of its divisors is an integer number (166559673).

Almost surely, 2^1109128745 is an apocalyptic number.

It is an amenable number.

1109128745 is a deficient number, since it is larger than the sum of its proper divisors (223348639).

1109128745 is an equidigital number, since it uses as much as digits as its factorization.

1109128745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 253819.

The product of its (nonzero) digits is 20160, while the sum is 38.

The square root of 1109128745 is about 33303.5845668300. The cubic root of 1109128745 is about 1035.1278347241.

The spelling of 1109128745 in words is "one billion, one hundred nine million, one hundred twenty-eight thousand, seven hundred forty-five".