1123609 has 4 divisors (see below), whose sum is σ = 1131300. Its totient is φ = 1115920.

The previous prime is 1123601. The next prime is 1123621. The reversal of 1123609 is 9063211.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 129600 + 994009 = 360^2 + 997^2 .

It is a cyclic number.

It is not a de Polignac number, because 1123609 - 2³ = 1123601 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1123609.

It is not an unprimeable number, because it can be changed into a prime (1123601) 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, 3622 + ... + 3919.

It is an arithmetic number, because the mean of its divisors is an integer number (282825).

2^1123609 is an apocalyptic number.

It is an amenable number.

1123609 is a deficient number, since it is larger than the sum of its proper divisors (7691).

1123609 is an equidigital number, since it uses as much as digits as its factorization.

1123609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7690.

The product of its (nonzero) digits is 324, while the sum is 22.

The square root of 1123609 is about 1060.0042452745. The cubic root of 1123609 is about 103.9613083389.

It can be divided in two parts, 112 and 3609, that added together give a square (3721 = 61²).

The spelling of 1123609 in words is "one million, one hundred twenty-three thousand, six hundred nine".