11105561 has 4 divisors (see below), whose sum is σ = 11134500. Its totient is φ = 11076624.

The previous prime is 11105551. The next prime is 11105569. The reversal of 11105561 is 16550111.

11105561 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: 16550111 = 2153 ⋅7687.

It can be written as a sum of positive squares in 2 ways, for example, as 2343961 + 8761600 = 1531^2 + 2960^2 .

It is a cyclic number.

It is not a de Polignac number, because 11105561 - 2¹⁰ = 11104537 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11105569) 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, 13886 + ... + 14663.

It is an arithmetic number, because the mean of its divisors is an integer number (2783625).

Almost surely, 2^11105561 is an apocalyptic number.

It is an amenable number.

11105561 is a deficient number, since it is larger than the sum of its proper divisors (28939).

11105561 is an equidigital number, since it uses as much as digits as its factorization.

11105561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28938.

The product of its (nonzero) digits is 150, while the sum is 20.

The square root of 11105561 is about 3332.5007126781. The cubic root of 11105561 is about 223.1071562335.

Adding to 11105561 its reverse (16550111), we get a palindrome (27655672).

The spelling of 11105561 in words is "eleven million, one hundred five thousand, five hundred sixty-one".