1123563 has 8 divisors (see below), whose sum is σ = 1712128. Its totient is φ = 642024.

The previous prime is 1123561. The next prime is 1123567. The reversal of 1123563 is 3653211.

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

It is not a de Polignac number, because 1123563 - 2¹ = 1123561 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21), and also a Moran number because the ratio is a prime number: 53503 = 1123563 / (1 + 1 + 2 + 3 + 5 + 6 + 3).

It is a Duffinian 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, 26731 + ... + 26772.

It is an arithmetic number, because the mean of its divisors is an integer number (214016).

2^1123563 is an apocalyptic number.

1123563 is a deficient number, since it is larger than the sum of its proper divisors (588565).

1123563 is an equidigital number, since it uses as much as digits as its factorization.

1123563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53513.

The product of its digits is 540, while the sum is 21.

The square root of 1123563 is about 1059.9825470261. The cubic root of 1123563 is about 103.9598896112.

Adding to 1123563 its reverse (3653211), we get a palindrome (4776774).

The spelling of 1123563 in words is "one million, one hundred twenty-three thousand, five hundred sixty-three".