520142209 has 2 divisors, whose sum is σ = 520142210. Its totient is φ = 520142208.

The previous prime is 520142177. The next prime is 520142221. The reversal of 520142209 is 902241025.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 428365809 + 91776400 = 20697^2 + 9580^2 .

It is a cyclic number.

It is not a de Polignac number, because 520142209 - 2⁵ = 520142177 is a prime.

It is not a weakly prime, because it can be changed into another prime (520142509) 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, 260071104 + 260071105.

It is an arithmetic number, because the mean of its divisors is an integer number (260071105).

Almost surely, 2^520142209 is an apocalyptic number.

It is an amenable number.

520142209 is a deficient number, since it is larger than the sum of its proper divisors (1).

520142209 is an equidigital number, since it uses as much as digits as its factorization.

520142209 is an odious number, because the sum of its binary digits is odd.

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

The square root of 520142209 is about 22806.6264274224. The cubic root of 520142209 is about 804.2184505991.

The spelling of 520142209 in words is "five hundred twenty million, one hundred forty-two thousand, two hundred nine".