531521 has 2 divisors, whose sum is σ = 531522. Its totient is φ = 531520.

The previous prime is 531497. The next prime is 531547. The reversal of 531521 is 125135.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 270400 + 261121 = 520^2 + 511^2 .

It is a cyclic number.

It is not a de Polignac number, because 531521 - 2⁶ = 531457 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 531521.

It is not a weakly prime, because it can be changed into another prime (531551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 265760 + 265761.

It is an arithmetic number, because the mean of its divisors is an integer number (265761).

2⁵³¹⁵²¹ is an apocalyptic number.

It is an amenable number.

531521 is a deficient number, since it is larger than the sum of its proper divisors (1).

531521 is an equidigital number, since it uses as much as digits as its factorization.

531521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 150, while the sum is 17.

The square root of 531521 is about 729.0548676197. The cubic root of 531521 is about 81.0040642171.

Adding to 531521 its reverse (125135), we get a palindrome (656656).

The spelling of 531521 in words is "five hundred thirty-one thousand, five hundred twenty-one".