521023 has 2 divisors, whose sum is σ = 521024. Its totient is φ = 521022.

The previous prime is 521021. The next prime is 521039. The reversal of 521023 is 320125.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 521023 - 2¹ = 521021 is a prime.

Together with 521021, it forms a pair of twin primes.

521023 is a lucky number.

It is a zygodrome in base 2.

It is a junction number, because it is equal to n+sod(n) for n = 520994 and 521012.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (521021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260511 + 260512.

It is an arithmetic number, because the mean of its divisors is an integer number (260512).

2⁵²¹⁰²³ is an apocalyptic number.

521023 is a deficient number, since it is larger than the sum of its proper divisors (1).

521023 is an equidigital number, since it uses as much as digits as its factorization.

521023 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 521023 is about 721.8192294474. The cubic root of 521023 is about 80.4672139934.

Adding to 521023 its reverse (320125), we get a palindrome (841148).

The spelling of 521023 in words is "five hundred twenty-one thousand, twenty-three".