523321 has 4 divisors (see below), whose sum is σ = 524772. Its totient is φ = 521872.

The previous prime is 523307. The next prime is 523333. The reversal of 523321 is 123325.

523321 is an esthetic number in base 9, because in such base its adjacent digits differ by 1.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 308025 + 215296 = 555^2 + 464^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-523321 is a prime.

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 = 523295 and 523304.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (523351) 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, 291 + ... + 1063.

It is an arithmetic number, because the mean of its divisors is an integer number (131193).

2⁵²³³²¹ is an apocalyptic number.

It is an amenable number.

523321 is a deficient number, since it is larger than the sum of its proper divisors (1451).

523321 is an equidigital number, since it uses as much as digits as its factorization.

523321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1450.

The product of its digits is 180, while the sum is 16.

The square root of 523321 is about 723.4092894068. The cubic root of 523321 is about 80.5853421532.

Adding to 523321 its reverse (123325), we get a palindrome (646646).

The spelling of 523321 in words is "five hundred twenty-three thousand, three hundred twenty-one".