520850821 has 2 divisors, whose sum is σ = 520850822. Its totient is φ = 520850820.

The previous prime is 520850791. The next prime is 520850833. The reversal of 520850821 is 128058025.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 369216225 + 151634596 = 19215^2 + 12314^2 .

It is a cyclic number.

It is not a de Polignac number, because 520850821 - 2¹¹ = 520848773 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 (520820821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260425410 + 260425411.

It is an arithmetic number, because the mean of its divisors is an integer number (260425411).

Almost surely, 2^520850821 is an apocalyptic number.

It is an amenable number.

520850821 is a deficient number, since it is larger than the sum of its proper divisors (1).

520850821 is an equidigital number, since it uses as much as digits as its factorization.

520850821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6400, while the sum is 31.

The square root of 520850821 is about 22822.1563617464. The cubic root of 520850821 is about 804.5834919541.

The spelling of 520850821 in words is "five hundred twenty million, eight hundred fifty thousand, eight hundred twenty-one".