523240321 has 4 divisors (see below), whose sum is σ = 523411200. Its totient is φ = 523069444.

The previous prime is 523240313. The next prime is 523240349. The reversal of 523240321 is 123042325.

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 523240321 - 2³ = 523240313 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 523240292 and 523240301.

It is not an unprimeable number, because it can be changed into a prime (523240391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 80761 + ... + 86998.

It is an arithmetic number, because the mean of its divisors is an integer number (130852800).

Almost surely, 2^523240321 is an apocalyptic number.

It is an amenable number.

523240321 is a deficient number, since it is larger than the sum of its proper divisors (170879).

523240321 is a wasteful number, since it uses less digits than its factorization.

523240321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 170878.

The product of its (nonzero) digits is 1440, while the sum is 22.

The square root of 523240321 is about 22874.4469004171. The cubic root of 523240321 is about 805.8120073146.

Adding to 523240321 its reverse (123042325), we get a palindrome (646282646).

The spelling of 523240321 in words is "five hundred twenty-three million, two hundred forty thousand, three hundred twenty-one".