520171213 has 4 divisors (see below), whose sum is σ = 520220700. Its totient is φ = 520121728.

The previous prime is 520171193. The next prime is 520171237. The reversal of 520171213 is 312171025.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 298667524 + 221503689 = 17282^2 + 14883^2 .

It is a cyclic number.

It is not a de Polignac number, because 520171213 - 2¹⁷ = 520040141 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (520171273) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2020 + ... + 32317.

It is an arithmetic number, because the mean of its divisors is an integer number (130055175).

Almost surely, 2^520171213 is an apocalyptic number.

It is an amenable number.

520171213 is a deficient number, since it is larger than the sum of its proper divisors (49487).

520171213 is a wasteful number, since it uses less digits than its factorization.

520171213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49486.

The product of its (nonzero) digits is 420, while the sum is 22.

The square root of 520171213 is about 22807.2622863859. The cubic root of 520171213 is about 804.2333985101.

The spelling of 520171213 in words is "five hundred twenty million, one hundred seventy-one thousand, two hundred thirteen".