1123443553 has 4 divisors (see below), whose sum is σ = 1123607808. Its totient is φ = 1123279300.

The previous prime is 1123443551. The next prime is 1123443577. The reversal of 1123443553 is 3553443211.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1123443553 - 2¹ = 1123443551 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1123443551) 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, 71401 + ... + 85702.

It is an arithmetic number, because the mean of its divisors is an integer number (280901952).

Almost surely, 2^1123443553 is an apocalyptic number.

It is an amenable number.

1123443553 is a deficient number, since it is larger than the sum of its proper divisors (164255).

1123443553 is an equidigital number, since it uses as much as digits as its factorization.

1123443553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 164254.

The product of its digits is 21600, while the sum is 31.

The square root of 1123443553 is about 33517.8094898816. The cubic root of 1123443553 is about 1039.5620545734.

Adding to 1123443553 its reverse (3553443211), we get a palindrome (4676886764).

The spelling of 1123443553 in words is "one billion, one hundred twenty-three million, four hundred forty-three thousand, five hundred fifty-three".