11561431603 has 4 divisors (see below), whose sum is σ = 11565802000. Its totient is φ = 11557061208.

The previous prime is 11561431601. The next prime is 11561431633. The reversal of 11561431603 is 30613416511.

11561431603 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 30613416511 = 30649 ⋅998839.

It is a cyclic number.

It is not a de Polignac number, because 11561431603 - 2¹ = 11561431601 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11561431601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2181228 + ... + 2186521.

It is an arithmetic number, because the mean of its divisors is an integer number (2891450500).

Almost surely, 2^11561431603 is an apocalyptic number.

11561431603 is a deficient number, since it is larger than the sum of its proper divisors (4370397).

11561431603 is an equidigital number, since it uses as much as digits as its factorization.

11561431603 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4370396.

The product of its (nonzero) digits is 6480, while the sum is 31.

The spelling of 11561431603 in words is "eleven billion, five hundred sixty-one million, four hundred thirty-one thousand, six hundred three".