1109945 has 4 divisors (see below), whose sum is σ = 1331940. Its totient is φ = 887952.

The previous prime is 1109921. The next prime is 1109951. The reversal of 1109945 is 5499011.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5499011 = 7 ⋅785573.

It can be written as a sum of positive squares in 2 ways, for example, as 822649 + 287296 = 907^2 + 536^2 .

It is a cyclic number.

It is not a de Polignac number, because 1109945 - 2⁶ = 1109881 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 110990 + ... + 110999.

It is an arithmetic number, because the mean of its divisors is an integer number (332985).

2^1109945 is an apocalyptic number.

It is an amenable number.

1109945 is a deficient number, since it is larger than the sum of its proper divisors (221995).

1109945 is an equidigital number, since it uses as much as digits as its factorization.

1109945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 221994.

The product of its (nonzero) digits is 1620, while the sum is 29.

The square root of 1109945 is about 1053.5392731170. The cubic root of 1109945 is about 103.5381703984.

The spelling of 1109945 in words is "one million, one hundred nine thousand, nine hundred forty-five".