521533 has 2 divisors, whose sum is σ = 521534. Its totient is φ = 521532.

The previous prime is 521527. The next prime is 521537. The reversal of 521533 is 335125.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 273529 + 248004 = 523^2 + 498^2 .

It is a cyclic number.

It is not a de Polignac number, because 521533 - 2⁹ = 521021 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 521533.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (521537) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260766 + 260767.

It is an arithmetic number, because the mean of its divisors is an integer number (260767).

2⁵²¹⁵³³ is an apocalyptic number.

It is an amenable number.

521533 is a deficient number, since it is larger than the sum of its proper divisors (1).

521533 is an equidigital number, since it uses as much as digits as its factorization.

521533 is an evil number, because the sum of its binary digits is even.

The product of its digits is 450, while the sum is 19.

The square root of 521533 is about 722.1724170861. The cubic root of 521533 is about 80.4934603692.

Adding to 521533 its reverse (335125), we get a palindrome (856658).

The spelling of 521533 in words is "five hundred twenty-one thousand, five hundred thirty-three".