523561 has 4 divisors (see below), whose sum is σ = 525312. Its totient is φ = 521812.

The previous prime is 523553. The next prime is 523571. The reversal of 523561 is 165325.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 523561 - 2³ = 523553 is a prime.

It is a super-2 number, since 2×523561² = 548232241442, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (523511) 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, 301 + ... + 1066.

It is an arithmetic number, because the mean of its divisors is an integer number (131328).

2⁵²³⁵⁶¹ is an apocalyptic number.

It is an amenable number.

523561 is a deficient number, since it is larger than the sum of its proper divisors (1751).

523561 is a wasteful number, since it uses less digits than its factorization.

523561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1750.

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

The square root of 523561 is about 723.5751515910. The cubic root of 523561 is about 80.5976593392.

Adding to 523561 its reverse (165325), we get a palindrome (688886).

The spelling of 523561 in words is "five hundred twenty-three thousand, five hundred sixty-one".