523722321 has 8 divisors (see below), whose sum is σ = 775884960. Its totient is φ = 349148196.

The previous prime is 523722319. The next prime is 523722359. The reversal of 523722321 is 123227325.

It is a happy number.

It is not a de Polignac number, because 523722321 - 2¹ = 523722319 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 19397123 = 523722321 / (5 + 2 + 3 + 7 + 2 + 2 + 3 + 2 + 1).

It is not an unprimeable number, because it can be changed into a prime (523722301) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9698535 + ... + 9698588.

It is an arithmetic number, because the mean of its divisors is an integer number (96985620).

Almost surely, 2^523722321 is an apocalyptic number.

It is an amenable number.

523722321 is a deficient number, since it is larger than the sum of its proper divisors (252162639).

523722321 is a wasteful number, since it uses less digits than its factorization.

523722321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19397132 (or 19397126 counting only the distinct ones).

The product of its digits is 5040, while the sum is 27.

The square root of 523722321 is about 22884.9802490629. The cubic root of 523722321 is about 806.0593647716.

Adding to 523722321 its reverse (123227325), we get a palindrome (646949646).

The spelling of 523722321 in words is "five hundred twenty-three million, seven hundred twenty-two thousand, three hundred twenty-one".