521225261 has 2 divisors, whose sum is σ = 521225262. Its totient is φ = 521225260.

The previous prime is 521225249. The next prime is 521225291. The reversal of 521225261 is 162522125.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 319301161 + 201924100 = 17869^2 + 14210^2 .

It is a cyclic number.

It is not a de Polignac number, because 521225261 - 2⁶ = 521225197 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 521225261.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (521225291) 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, 260612630 + 260612631.

It is an arithmetic number, because the mean of its divisors is an integer number (260612631).

Almost surely, 2^521225261 is an apocalyptic number.

It is an amenable number.

521225261 is a deficient number, since it is larger than the sum of its proper divisors (1).

521225261 is an equidigital number, since it uses as much as digits as its factorization.

521225261 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2400, while the sum is 26.

The square root of 521225261 is about 22830.3583195709. The cubic root of 521225261 is about 804.7762509716.

Adding to 521225261 its reverse (162522125), we get a palindrome (683747386).

The spelling of 521225261 in words is "five hundred twenty-one million, two hundred twenty-five thousand, two hundred sixty-one".