561123 has 6 divisors (see below), whose sum is σ = 810524. Its totient is φ = 374076.

The previous prime is 561109. The next prime is 561161. The reversal of 561123 is 321165.

It is not a de Polignac number, because 561123 - 2⁵ = 561091 is a prime.

It is a super-2 number, since 2×561123² = 629718042258, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 561096 and 561105.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 561123.

It is not an unprimeable number, because it can be changed into a prime (561103) 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 5 ways as a sum of consecutive naturals, for example, 31165 + ... + 31182.

2⁵⁶¹¹²³ is an apocalyptic number.

561123 is a deficient number, since it is larger than the sum of its proper divisors (249401).

561123 is a wasteful number, since it uses less digits than its factorization.

561123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62353 (or 62350 counting only the distinct ones).

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

The square root of 561123 is about 749.0814374953. The cubic root of 561123 is about 82.4807668664.

Adding to 561123 its reverse (321165), we get a palindrome (882288).

The spelling of 561123 in words is "five hundred sixty-one thousand, one hundred twenty-three".