525345221 has 2 divisors, whose sum is σ = 525345222. Its totient is φ = 525345220.

The previous prime is 525345211. The next prime is 525345257. The reversal of 525345221 is 122543525.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 450712900 + 74632321 = 21230^2 + 8639^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-525345221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (525345211) 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, 262672610 + 262672611.

It is an arithmetic number, because the mean of its divisors is an integer number (262672611).

Almost surely, 2^525345221 is an apocalyptic number.

It is an amenable number.

525345221 is a deficient number, since it is larger than the sum of its proper divisors (1).

525345221 is an equidigital number, since it uses as much as digits as its factorization.

525345221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12000, while the sum is 29.

The square root of 525345221 is about 22920.4105766018. The cubic root of 525345221 is about 806.8911063170.

Adding to 525345221 its reverse (122543525), we get a palindrome (647888746).

The spelling of 525345221 in words is "five hundred twenty-five million, three hundred forty-five thousand, two hundred twenty-one".