525221 has 2 divisors, whose sum is σ = 525222. Its totient is φ = 525220.

The previous prime is 525209. The next prime is 525241. The reversal of 525221 is 122525.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 376996 + 148225 = 614^2 + 385^2 .

It is a cyclic number.

It is not a de Polignac number, because 525221 - 2⁶ = 525157 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 525221.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 525221.

It is not a weakly prime, because it can be changed into another prime (525241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 262610 + 262611.

It is an arithmetic number, because the mean of its divisors is an integer number (262611).

2⁵²⁵²²¹ is an apocalyptic number.

It is an amenable number.

525221 is a deficient number, since it is larger than the sum of its proper divisors (1).

525221 is an equidigital number, since it uses as much as digits as its factorization.

525221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 200, while the sum is 17.

The square root of 525221 is about 724.7213257522. The cubic root of 525221 is about 80.6827503238.

Adding to 525221 its reverse (122525), we get a palindrome (647746).

The spelling of 525221 in words is "five hundred twenty-five thousand, two hundred twenty-one".