523020321 has 14 divisors (see below), whose sum is σ = 784172850. Its totient is φ = 348679728.

The previous prime is 523020263. The next prime is 523020367. The reversal of 523020321 is 123020325.

It can be written as a sum of positive squares in only one way, i.e., 417752721 + 105267600 = 20439^2 + 10260^2 .

It is not a de Polignac number, because 523020321 - 2⁶ = 523020257 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 523020294 and 523020303.

It is not an unprimeable number, because it can be changed into a prime (523020221) 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 13 ways as a sum of consecutive naturals, for example, 357996 + ... + 359453.

Almost surely, 2^523020321 is an apocalyptic number.

It is an amenable number.

523020321 is a deficient number, since it is larger than the sum of its proper divisors (261152529).

523020321 is an frugal number, since it uses more digits than its factorization.

523020321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 717467 (or 717452 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 18.

The square root of 523020321 is about 22869.6375353874. The cubic root of 523020321 is about 805.6990550781.

Adding to 523020321 its reverse (123020325), we get a palindrome (646040646).

The spelling of 523020321 in words is "five hundred twenty-three million, twenty thousand, three hundred twenty-one".