11561103 has 16 divisors (see below), whose sum is σ = 17190240. Its totient is φ = 7679232.

The previous prime is 11561089. The next prime is 11561117. The reversal of 11561103 is 30116511.

11561103 is a `hidden beast` number, since 1 + 1 + 561 + 103 = 666.

It is an interprime number because it is at equal distance from previous prime (11561089) and next prime (11561117).

It is not a de Polignac number, because 11561103 - 2⁴ = 11561087 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11561903) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8925 + ... + 10137.

It is an arithmetic number, because the mean of its divisors is an integer number (1074390).

Almost surely, 2^11561103 is an apocalyptic number.

11561103 is a deficient number, since it is larger than the sum of its proper divisors (5629137).

11561103 is a wasteful number, since it uses less digits than its factorization.

11561103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1575 (or 1569 counting only the distinct ones).

The product of its (nonzero) digits is 90, while the sum is 18.

The square root of 11561103 is about 3400.1622020133. The cubic root of 11561103 is about 226.1169350742.

Adding to 11561103 its reverse (30116511), we get a palindrome (41677614).

It can be divided in two parts, 11561 and 103, that added together give a square (11664 = 108²).

The spelling of 11561103 in words is "eleven million, five hundred sixty-one thousand, one hundred three".