11561311741 has 4 divisors (see below), whose sum is σ = 13212927712. Its totient is φ = 9909695772.

The previous prime is 11561311717. The next prime is 11561311763. The reversal of 11561311741 is 14711316511.

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 11561311741 - 2¹⁷ = 11561180669 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 (11561311711) 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, 825807975 + ... + 825807988.

It is an arithmetic number, because the mean of its divisors is an integer number (3303231928).

Almost surely, 2^11561311741 is an apocalyptic number.

It is an amenable number.

11561311741 is a deficient number, since it is larger than the sum of its proper divisors (1651615971).

11561311741 is an equidigital number, since it uses as much as digits as its factorization.

11561311741 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1651615970.

The product of its digits is 2520, while the sum is 31.

The spelling of 11561311741 in words is "eleven billion, five hundred sixty-one million, three hundred eleven thousand, seven hundred forty-one".