1123543 has 4 divisors (see below), whose sum is σ = 1139008. Its totient is φ = 1108080.

The previous prime is 1123541. The next prime is 1123553. The reversal of 1123543 is 3453211.

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

It is a cyclic number.

It is not a de Polignac number, because 1123543 - 2¹ = 1123541 is a prime.

It is a Duffinian number.

1123543 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 1123543.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1123541) 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, 7623 + ... + 7768.

It is an arithmetic number, because the mean of its divisors is an integer number (284752).

2^1123543 is an apocalyptic number.

1123543 is a deficient number, since it is larger than the sum of its proper divisors (15465).

1123543 is an equidigital number, since it uses as much as digits as its factorization.

1123543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15464.

The product of its digits is 360, while the sum is 19.

The square root of 1123543 is about 1059.9731128665. The cubic root of 1123543 is about 103.9592727611.

Adding to 1123543 its reverse (3453211), we get a palindrome (4576754).

It can be divided in two parts, 112 and 3543, that added together give a triangular number (3655 = T₈₅).

The spelling of 1123543 in words is "one million, one hundred twenty-three thousand, five hundred forty-three".