523405321 has 2 divisors, whose sum is σ = 523405322. Its totient is φ = 523405320.

The previous prime is 523405261. The next prime is 523405327. The reversal of 523405321 is 123504325.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 411278400 + 112126921 = 20280^2 + 10589^2 .

It is a cyclic number.

It is not a de Polignac number, because 523405321 - 2⁹ = 523404809 is a prime.

It is a super-2 number, since 2×523405321² = 547906260102226082, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (523405327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 261702660 + 261702661.

It is an arithmetic number, because the mean of its divisors is an integer number (261702661).

Almost surely, 2^523405321 is an apocalyptic number.

It is an amenable number.

523405321 is a deficient number, since it is larger than the sum of its proper divisors (1).

523405321 is an equidigital number, since it uses as much as digits as its factorization.

523405321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3600, while the sum is 25.

The square root of 523405321 is about 22878.0532607125. The cubic root of 523405321 is about 805.8967007161.

Adding to 523405321 its reverse (123504325), we get a palindrome (646909646).

The spelling of 523405321 in words is "five hundred twenty-three million, four hundred five thousand, three hundred twenty-one".