521225513 has 2 divisors, whose sum is σ = 521225514. Its totient is φ = 521225512.

The previous prime is 521225503. The next prime is 521225531. The reversal of 521225513 is 315522125.

Together with next prime (521225531) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 516743824 + 4481689 = 22732^2 + 2117^2 .

It is a cyclic number.

It is not a de Polignac number, because 521225513 - 2¹² = 521221417 is a prime.

It is a super-2 number, since 2×521225513² = 543352070804226338, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is equal to p_27413531 and since 521225513 and 27413531 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (521225503) 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, 260612756 + 260612757.

It is an arithmetic number, because the mean of its divisors is an integer number (260612757).

Almost surely, 2^521225513 is an apocalyptic number.

It is an amenable number.

521225513 is a deficient number, since it is larger than the sum of its proper divisors (1).

521225513 is an equidigital number, since it uses as much as digits as its factorization.

521225513 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3000, while the sum is 26.

The square root of 521225513 is about 22830.3638385375. The cubic root of 521225513 is about 804.7763806683.

Adding to 521225513 its reverse (315522125), we get a palindrome (836747638).

The spelling of 521225513 in words is "five hundred twenty-one million, two hundred twenty-five thousand, five hundred thirteen".