561023 has 4 divisors (see below), whose sum is σ = 566280. Its totient is φ = 555768.

The previous prime is 561019. The next prime is 561047. The reversal of 561023 is 320165.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 320165 = 5 ⋅64033.

It is a cyclic number.

It is not a de Polignac number, because 561023 - 2² = 561019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 560992 and 561010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561053) 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, 2465 + ... + 2682.

It is an arithmetic number, because the mean of its divisors is an integer number (141570).

2⁵⁶¹⁰²³ is an apocalyptic number.

561023 is a deficient number, since it is larger than the sum of its proper divisors (5257).

561023 is a wasteful number, since it uses less digits than its factorization.

561023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5256.

The product of its (nonzero) digits is 180, while the sum is 17.

The square root of 561023 is about 749.0146861044. The cubic root of 561023 is about 82.4758668316.

Adding to 561023 its reverse (320165), we get a palindrome (881188).

The spelling of 561023 in words is "five hundred sixty-one thousand, twenty-three".