8067821 has 2 divisors, whose sum is σ = 8067822. Its totient is φ = 8067820.

The previous prime is 8067817. The next prime is 8067823. The reversal of 8067821 is 1287608.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4791721 + 3276100 = 2189^2 + 1810^2 .

It is a cyclic number.

It is not a de Polignac number, because 8067821 - 2² = 8067817 is a prime.

It is a Sophie Germain prime.

Together with 8067823, it forms a pair of twin primes.

It is a Chen 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 (8067823) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4033910 + 4033911.

It is an arithmetic number, because the mean of its divisors is an integer number (4033911).

Almost surely, 2^8067821 is an apocalyptic number.

It is an amenable number.

8067821 is a deficient number, since it is larger than the sum of its proper divisors (1).

8067821 is an equidigital number, since it uses as much as digits as its factorization.

8067821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5376, while the sum is 32.

The square root of 8067821 is about 2840.3909942119. The cubic root of 8067821 is about 200.5635853659.

It can be divided in two parts, 8067 and 821, that added together give a palindrome (8888).

The spelling of 8067821 in words is "eight million, sixty-seven thousand, eight hundred twenty-one".