816246521 has 2 divisors, whose sum is σ = 816246522. Its totient is φ = 816246520.

The previous prime is 816246443. The next prime is 816246527. The reversal of 816246521 is 125642618.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 815959225 + 287296 = 28565^2 + 536^2 .

It is a cyclic number.

It is not a de Polignac number, because 816246521 - 2¹⁴ = 816230137 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (816246527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 408123260 + 408123261.

It is an arithmetic number, because the mean of its divisors is an integer number (408123261).

Almost surely, 2^816246521 is an apocalyptic number.

It is an amenable number.

816246521 is a deficient number, since it is larger than the sum of its proper divisors (1).

816246521 is an equidigital number, since it uses as much as digits as its factorization.

816246521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 23040, while the sum is 35.

The square root of 816246521 is about 28570.0283689044. The cubic root of 816246521 is about 934.5598397215.

The spelling of 816246521 in words is "eight hundred sixteen million, two hundred forty-six thousand, five hundred twenty-one".