521752213 has 2 divisors, whose sum is σ = 521752214. Its totient is φ = 521752212.

The previous prime is 521752211. The next prime is 521752237. The reversal of 521752213 is 312257125.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 507060324 + 14691889 = 22518^2 + 3833^2 .

It is a cyclic number.

It is not a de Polignac number, because 521752213 - 2¹ = 521752211 is a prime.

Together with 521752211, 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 (521752211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260876106 + 260876107.

It is an arithmetic number, because the mean of its divisors is an integer number (260876107).

Almost surely, 2^521752213 is an apocalyptic number.

It is an amenable number.

521752213 is a deficient number, since it is larger than the sum of its proper divisors (1).

521752213 is an equidigital number, since it uses as much as digits as its factorization.

521752213 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4200, while the sum is 28.

The square root of 521752213 is about 22841.8960027402. The cubic root of 521752213 is about 805.0473657559.

The spelling of 521752213 in words is "five hundred twenty-one million, seven hundred fifty-two thousand, two hundred thirteen".