2561103 has 12 divisors (see below), whose sum is σ = 3799848. Its totient is φ = 1661040.

The previous prime is 2561099. The next prime is 2561129. The reversal of 2561103 is 3011652.

2561103 is a `hidden beast` number, since 2 + 561 + 103 = 666.

2561103 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 2561103 - 2² = 2561099 is a prime.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2565103) 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 11 ways as a sum of consecutive naturals, for example, 3513 + ... + 4178.

It is an arithmetic number, because the mean of its divisors is an integer number (316654).

2^2561103 is an apocalyptic number.

2561103 is a deficient number, since it is larger than the sum of its proper divisors (1238745).

2561103 is a wasteful number, since it uses less digits than its factorization.

2561103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7734 (or 7731 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 18.

The square root of 2561103 is about 1600.3446503800. The cubic root of 2561103 is about 136.8177198243.

Adding to 2561103 its reverse (3011652), we get a palindrome (5572755).

The spelling of 2561103 in words is "two million, five hundred sixty-one thousand, one hundred three".