523113021 has 12 divisors (see below), whose sum is σ = 769865148. Its totient is φ = 342161664.

The previous prime is 523113011. The next prime is 523113029. The reversal of 523113021 is 120311325.

523113021 is a `hidden beast` number, since 52 + 311 + 302 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 426876921 + 96236100 = 20661^2 + 9810^2 .

It is not a de Polignac number, because 523113021 - 2⁹ = 523112509 is a prime.

It is a Curzon number.

It is a zygodrome in base 3.

It is a junction number, because it is equal to n+sod(n) for n = 523112985 and 523113003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (523113029) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 547860 + ... + 548813.

It is an arithmetic number, because the mean of its divisors is an integer number (64155429).

Almost surely, 2^523113021 is an apocalyptic number.

It is an amenable number.

523113021 is a deficient number, since it is larger than the sum of its proper divisors (246752127).

523113021 is a wasteful number, since it uses less digits than its factorization.

523113021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1096732 (or 1096729 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 18.

The square root of 523113021 is about 22871.6641502100. The cubic root of 523113021 is about 805.7466529038.

Adding to 523113021 its reverse (120311325), we get a palindrome (643424346).

The spelling of 523113021 in words is "five hundred twenty-three million, one hundred thirteen thousand, twenty-one".