1123565 has 8 divisors (see below), whose sum is σ = 1419360. Its totient is φ = 851472.

The previous prime is 1123561. The next prime is 1123567. The reversal of 1123565 is 5653211.

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 1123565 - 2² = 1123561 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1123565.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1123561) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5819 + ... + 6008.

It is an arithmetic number, because the mean of its divisors is an integer number (177420).

2^1123565 is an apocalyptic number.

It is an amenable number.

1123565 is a deficient number, since it is larger than the sum of its proper divisors (295795).

1123565 is a wasteful number, since it uses less digits than its factorization.

1123565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11851.

The product of its digits is 900, while the sum is 23.

The square root of 1123565 is about 1059.9834904375. The cubic root of 1123565 is about 103.9599512959.

Adding to 1123565 its reverse (5653211), we get a palindrome (6776776).

The spelling of 1123565 in words is "one million, one hundred twenty-three thousand, five hundred sixty-five".