1109128873 has 4 divisors (see below), whose sum is σ = 1109333188. Its totient is φ = 1108924560.

The previous prime is 1109128871. The next prime is 1109128877. The reversal of 1109128873 is 3788219011.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3788219011 = 61 ⋅62101951.

It can be written as a sum of positive squares in 2 ways, for example, as 676156009 + 432972864 = 26003^2 + 20808^2 .

It is a cyclic number.

It is not a de Polignac number, because 1109128873 - 2¹ = 1109128871 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1109128871) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 93786 + ... + 104947.

It is an arithmetic number, because the mean of its divisors is an integer number (277333297).

Almost surely, 2^1109128873 is an apocalyptic number.

It is an amenable number.

1109128873 is a deficient number, since it is larger than the sum of its proper divisors (204315).

1109128873 is an equidigital number, since it uses as much as digits as its factorization.

1109128873 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 204314.

The product of its (nonzero) digits is 24192, while the sum is 40.

The square root of 1109128873 is about 33303.5864885450. The cubic root of 1109128873 is about 1035.1278745440.

The spelling of 1109128873 in words is "one billion, one hundred nine million, one hundred twenty-eight thousand, eight hundred seventy-three".