523021 has 2 divisors, whose sum is σ = 523022. Its totient is φ = 523020.

The previous prime is 523007. The next prime is 523031. The reversal of 523021 is 120325.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 509796 + 13225 = 714^2 + 115^2 .

It is a cyclic number.

It is not a de Polignac number, because 523021 - 2⁵ = 522989 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 522992 and 523010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (523031) 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 as a sum of consecutive naturals, namely, 261510 + 261511.

It is an arithmetic number, because the mean of its divisors is an integer number (261511).

2⁵²³⁰²¹ is an apocalyptic number.

It is an amenable number.

523021 is a deficient number, since it is larger than the sum of its proper divisors (1).

523021 is an equidigital number, since it uses as much as digits as its factorization.

523021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 60, while the sum is 13.

The square root of 523021 is about 723.2019081833. The cubic root of 523021 is about 80.5699403739.

Adding to 523021 its reverse (120325), we get a palindrome (643346).

The spelling of 523021 in words is "five hundred twenty-three thousand, twenty-one".