520216309 has 2 divisors, whose sum is σ = 520216310. Its totient is φ = 520216308.

The previous prime is 520216289. The next prime is 520216331. The reversal of 520216309 is 903612025.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 515153809 + 5062500 = 22697^2 + 2250^2 .

It is a cyclic number.

It is not a de Polignac number, because 520216309 - 2⁹ = 520215797 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (520216349) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260108154 + 260108155.

It is an arithmetic number, because the mean of its divisors is an integer number (260108155).

Almost surely, 2^520216309 is an apocalyptic number.

It is an amenable number.

520216309 is a deficient number, since it is larger than the sum of its proper divisors (1).

520216309 is an equidigital number, since it uses as much as digits as its factorization.

520216309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3240, while the sum is 28.

The square root of 520216309 is about 22808.2508974274. The cubic root of 520216309 is about 804.2566387179.

The spelling of 520216309 in words is "five hundred twenty million, two hundred sixteen thousand, three hundred nine".