1123541563 has 4 divisors (see below), whose sum is σ = 1125322768. Its totient is φ = 1121760360.

The previous prime is 1123541537. The next prime is 1123541581. The reversal of 1123541563 is 3651453211.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1123541563 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1123541863) 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, 889656 + ... + 890917.

It is an arithmetic number, because the mean of its divisors is an integer number (281330692).

Almost surely, 2^1123541563 is an apocalyptic number.

1123541563 is a deficient number, since it is larger than the sum of its proper divisors (1781205).

1123541563 is an equidigital number, since it uses as much as digits as its factorization.

1123541563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1781204.

The product of its digits is 10800, while the sum is 31.

The square root of 1123541563 is about 33519.2715165470. The cubic root of 1123541563 is about 1039.5922844009.

Adding to 1123541563 its reverse (3651453211), we get a palindrome (4774994774).

The spelling of 1123541563 in words is "one billion, one hundred twenty-three million, five hundred forty-one thousand, five hundred sixty-three".