3066821 has 2 divisors, whose sum is σ = 3066822. Its totient is φ = 3066820.

The previous prime is 3066793. The next prime is 3066823. The reversal of 3066821 is 1286603.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2592100 + 474721 = 1610^2 + 689^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3066821 is a prime.

It is a Sophie Germain prime.

Together with 3066823, 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 (3066823) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1533410 + 1533411.

It is an arithmetic number, because the mean of its divisors is an integer number (1533411).

Almost surely, 2^3066821 is an apocalyptic number.

It is an amenable number.

3066821 is a deficient number, since it is larger than the sum of its proper divisors (1).

3066821 is an equidigital number, since it uses as much as digits as its factorization.

3066821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 3066821 is about 1751.2341362593. The cubic root of 3066821 is about 145.2879099177.

The spelling of 3066821 in words is "three million, sixty-six thousand, eight hundred twenty-one".