525204221 has 2 divisors, whose sum is σ = 525204222. Its totient is φ = 525204220.

The previous prime is 525204217. The next prime is 525204227. The reversal of 525204221 is 122402525.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 443102500 + 82101721 = 21050^2 + 9061^2 .

It is a cyclic number.

It is not a de Polignac number, because 525204221 - 2² = 525204217 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (525204227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 262602110 + 262602111.

It is an arithmetic number, because the mean of its divisors is an integer number (262602111).

Almost surely, 2^525204221 is an apocalyptic number.

It is an amenable number.

525204221 is a deficient number, since it is larger than the sum of its proper divisors (1).

525204221 is an equidigital number, since it uses as much as digits as its factorization.

525204221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1600, while the sum is 23.

The square root of 525204221 is about 22917.3345090567. The cubic root of 525204221 is about 806.8189113605.

Adding to 525204221 its reverse (122402525), we get a palindrome (647606746).

The spelling of 525204221 in words is "five hundred twenty-five million, two hundred four thousand, two hundred twenty-one".