561111 has 8 divisors (see below), whose sum is σ = 762480. Its totient is φ = 366912.

The previous prime is 561109. The next prime is 561161. The reversal of 561111 is 111165.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 561111 - 2¹ = 561109 is a prime.

561111 is a modest number, since divided by 1111 gives 56 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561101) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1606 + ... + 1923.

It is an arithmetic number, because the mean of its divisors is an integer number (95310).

2⁵⁶¹¹¹¹ is an apocalyptic number.

561111 is a deficient number, since it is larger than the sum of its proper divisors (201369).

561111 is a wasteful number, since it uses less digits than its factorization.

561111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3585.

The product of its digits is 30, while the sum is 15.

The square root of 561111 is about 749.0734276424. The cubic root of 561111 is about 82.4801788930.

Adding to 561111 its reverse (111165), we get a palindrome (672276).

It can be divided in two parts, 5 and 61111, that added together give a palindrome (61116).

The spelling of 561111 in words is "five hundred sixty-one thousand, one hundred eleven".