5561111 has 4 divisors (see below), whose sum is σ = 5613192. Its totient is φ = 5509032.

The previous prime is 5561099. The next prime is 5561119. The reversal of 5561111 is 1111655.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-5561111 is a prime.

It is an Ulam number.

It is a Duffinian number.

5561111 is a modest number, since divided by 1111 gives 556 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5561119) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25880 + ... + 26093.

It is an arithmetic number, because the mean of its divisors is an integer number (1403298).

Almost surely, 2^5561111 is an apocalyptic number.

5561111 is a deficient number, since it is larger than the sum of its proper divisors (52081).

5561111 is a wasteful number, since it uses less digits than its factorization.

5561111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52080.

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

The square root of 5561111 is about 2358.2007972181. The cubic root of 5561111 is about 177.1687772697.

Adding to 5561111 its reverse (1111655), we get a palindrome (6672766).

It can be divided in two parts, 556 and 1111, that multiplied together give a palindrome (617716).

The spelling of 5561111 in words is "five million, five hundred sixty-one thousand, one hundred eleven".