11563531541 has 4 divisors (see below), whose sum is σ = 11736121632. Its totient is φ = 11390941452.

The previous prime is 11563531501. The next prime is 11563531549. The reversal of 11563531541 is 14513536511.

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 a de Polignac number, because none of the positive numbers 2^k-11563531541 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11563531549) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 86294945 + ... + 86295078.

It is an arithmetic number, because the mean of its divisors is an integer number (2934030408).

Almost surely, 2^11563531541 is an apocalyptic number.

It is an amenable number.

11563531541 is a deficient number, since it is larger than the sum of its proper divisors (172590091).

11563531541 is an equidigital number, since it uses as much as digits as its factorization.

11563531541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172590090.

The product of its digits is 27000, while the sum is 35.

The spelling of 11563531541 in words is "eleven billion, five hundred sixty-three million, five hundred thirty-one thousand, five hundred forty-one".