306066821 has 2 divisors, whose sum is σ = 306066822. Its totient is φ = 306066820.

The previous prime is 306066811. The next prime is 306066823. The reversal of 306066821 is 128660603.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 190826596 + 115240225 = 13814^2 + 10735^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-306066821 is a prime.

Together with 306066823, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (306066823) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 153033410 + 153033411.

It is an arithmetic number, because the mean of its divisors is an integer number (153033411).

Almost surely, 2^306066821 is an apocalyptic number.

It is an amenable number.

306066821 is a deficient number, since it is larger than the sum of its proper divisors (1).

306066821 is an equidigital number, since it uses as much as digits as its factorization.

306066821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10368, while the sum is 32.

The square root of 306066821 is about 17494.7655314383. The cubic root of 306066821 is about 673.9154570851.

The spelling of 306066821 in words is "three hundred six million, sixty-six thousand, eight hundred twenty-one".