521425213 has 2 divisors, whose sum is σ = 521425214. Its totient is φ = 521425212.

The previous prime is 521425211. The next prime is 521425237. The reversal of 521425213 is 312524125.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 518609529 + 2815684 = 22773^2 + 1678^2 .

It is a cyclic number.

It is not a de Polignac number, because 521425213 - 2¹ = 521425211 is a prime.

Together with 521425211, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (521425211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260712606 + 260712607.

It is an arithmetic number, because the mean of its divisors is an integer number (260712607).

Almost surely, 2^521425213 is an apocalyptic number.

It is an amenable number.

521425213 is a deficient number, since it is larger than the sum of its proper divisors (1).

521425213 is an equidigital number, since it uses as much as digits as its factorization.

521425213 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2400, while the sum is 25.

The square root of 521425213 is about 22834.7369811872. The cubic root of 521425213 is about 804.8791470132.

Adding to 521425213 its reverse (312524125), we get a palindrome (833949338).

The spelling of 521425213 in words is "five hundred twenty-one million, four hundred twenty-five thousand, two hundred thirteen".