523581 has 4 divisors (see below), whose sum is σ = 698112. Its totient is φ = 349052.

The previous prime is 523577. The next prime is 523597. The reversal of 523581 is 185325.

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 523581 - 2² = 523577 is a prime.

It is a super-2 number, since 2×523581² = 548274127122, which contains 22 as substring.

It is a D-number.

523581 is a lucky number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 523581.

It is not an unprimeable number, because it can be changed into a prime (523511) 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, 87261 + ... + 87266.

It is an arithmetic number, because the mean of its divisors is an integer number (174528).

2⁵²³⁵⁸¹ is an apocalyptic number.

It is an amenable number.

523581 is a deficient number, since it is larger than the sum of its proper divisors (174531).

523581 is a wasteful number, since it uses less digits than its factorization.

523581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 174530.

The product of its digits is 1200, while the sum is 24.

The square root of 523581 is about 723.5889717236. The cubic root of 523581 is about 80.5986856015.

The spelling of 523581 in words is "five hundred twenty-three thousand, five hundred eighty-one".