812304821 has 2 divisors, whose sum is σ = 812304822. Its totient is φ = 812304820.

The previous prime is 812304817. The next prime is 812304839. The reversal of 812304821 is 128403218.

812304821 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 578643025 + 233661796 = 24055^2 + 15286^2 .

It is a cyclic number.

It is not a de Polignac number, because 812304821 - 2² = 812304817 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (812304841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 406152410 + 406152411.

It is an arithmetic number, because the mean of its divisors is an integer number (406152411).

Almost surely, 2^812304821 is an apocalyptic number.

It is an amenable number.

812304821 is a deficient number, since it is larger than the sum of its proper divisors (1).

812304821 is an equidigital number, since it uses as much as digits as its factorization.

812304821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3072, while the sum is 29.

The square root of 812304821 is about 28500.9617557022. The cubic root of 812304821 is about 933.0530644723.

The spelling of 812304821 in words is "eight hundred twelve million, three hundred four thousand, eight hundred twenty-one".