521164213 has 2 divisors, whose sum is σ = 521164214. Its totient is φ = 521164212.

The previous prime is 521164183. The next prime is 521164229. The reversal of 521164213 is 312461125.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 473802289 + 47361924 = 21767^2 + 6882^2 .

It is a cyclic number.

It is not a de Polignac number, because 521164213 - 2⁹ = 521163701 is a prime.

It is a super-2 number, since 2×521164213² = 543224273823818738, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (521164013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260582106 + 260582107.

It is an arithmetic number, because the mean of its divisors is an integer number (260582107).

Almost surely, 2^521164213 is an apocalyptic number.

It is an amenable number.

521164213 is a deficient number, since it is larger than the sum of its proper divisors (1).

521164213 is an equidigital number, since it uses as much as digits as its factorization.

521164213 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1440, while the sum is 25.

The square root of 521164213 is about 22829.0212887018. The cubic root of 521164213 is about 804.7448302005.

The spelling of 521164213 in words is "five hundred twenty-one million, one hundred sixty-four thousand, two hundred thirteen".