11541313561 has 4 divisors (see below), whose sum is σ = 11786873472. Its totient is φ = 11295753652.

The previous prime is 11541313529. The next prime is 11541313571. The reversal of 11541313561 is 16531314511.

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, and also an emirpimes, since its reverse is a distinct semiprime: 16531314511 = 27697 ⋅596863.

It is a cyclic number.

It is not a de Polignac number, because 11541313561 - 2⁵ = 11541313529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11541313571) 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, 122779885 + ... + 122779978.

It is an arithmetic number, because the mean of its divisors is an integer number (2946718368).

Almost surely, 2^11541313561 is an apocalyptic number.

It is an amenable number.

11541313561 is a deficient number, since it is larger than the sum of its proper divisors (245559911).

11541313561 is an equidigital number, since it uses as much as digits as its factorization.

11541313561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 245559910.

The product of its digits is 5400, while the sum is 31.

The spelling of 11541313561 in words is "eleven billion, five hundred forty-one million, three hundred thirteen thousand, five hundred sixty-one".