561523 has 4 divisors (see below), whose sum is σ = 564840. Its totient is φ = 558208.

The previous prime is 561521. The next prime is 561529. The reversal of 561523 is 325165.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 325165 = 5 ⋅65033.

It is a cyclic number.

It is not a de Polignac number, because 561523 - 2¹ = 561521 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 561494 and 561503.

It is not an unprimeable number, because it can be changed into a prime (561521) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1390 + ... + 1747.

It is an arithmetic number, because the mean of its divisors is an integer number (141210).

2⁵⁶¹⁵²³ is an apocalyptic number.

561523 is a deficient number, since it is larger than the sum of its proper divisors (3317).

561523 is a wasteful number, since it uses less digits than its factorization.

561523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3316.

The product of its digits is 900, while the sum is 22.

The square root of 561523 is about 749.3483835974. The cubic root of 561523 is about 82.5003611861.

Adding to 561523 its reverse (325165), we get a palindrome (886688).

The spelling of 561523 in words is "five hundred sixty-one thousand, five hundred twenty-three".