800000521 has 2 divisors, whose sum is σ = 800000522. Its totient is φ = 800000520.

The previous prime is 800000507. The next prime is 800000527. The reversal of 800000521 is 125000008.

It is a happy number.

800000521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 616777225 + 183223296 = 24835^2 + 13536^2 .

It is a cyclic number.

It is not a de Polignac number, because 800000521 - 2¹¹ = 799998473 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 800000495 and 800000504.

It is not a weakly prime, because it can be changed into another prime (800000527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 400000260 + 400000261.

It is an arithmetic number, because the mean of its divisors is an integer number (400000261).

Almost surely, 2^800000521 is an apocalyptic number.

It is an amenable number.

800000521 is a deficient number, since it is larger than the sum of its proper divisors (1).

800000521 is an equidigital number, since it uses as much as digits as its factorization.

800000521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 80, while the sum is 16.

The square root of 800000521 is about 28284.2804575262. The cubic root of 800000521 is about 928.3179682448.

Adding to 800000521 its reverse (125000008), we get a palindrome (925000529).

The spelling of 800000521 in words is "eight hundred million, five hundred twenty-one", and thus it is an aban number.