5661111 has 8 divisors (see below), whose sum is σ = 7752304. Its totient is φ = 3672000.

The previous prime is 5661083. The next prime is 5661113. The reversal of 5661111 is 1111665.

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

It is not a de Polignac number, because 5661111 - 2¹⁰ = 5660087 is a prime.

It is a Duffinian number.

5661111 is a modest number, since divided by 1111 gives 566 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5661113) 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 7 ways as a sum of consecutive naturals, for example, 25390 + ... + 25611.

It is an arithmetic number, because the mean of its divisors is an integer number (969038).

Almost surely, 2^5661111 is an apocalyptic number.

5661111 is a deficient number, since it is larger than the sum of its proper divisors (2091193).

5661111 is a wasteful number, since it uses less digits than its factorization.

5661111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51041.

The product of its digits is 180, while the sum is 21.

The square root of 5661111 is about 2379.3089332829. The cubic root of 5661111 is about 178.2244255021.

Adding to 5661111 its reverse (1111665), we get a palindrome (6772776).

It can be divided in two parts, 566 and 1111, that multiplied together give a palindrome (628826).

The spelling of 5661111 in words is "five million, six hundred sixty-one thousand, one hundred eleven".