306134221 has 2 divisors, whose sum is σ = 306134222. Its totient is φ = 306134220.

The previous prime is 306134161. The next prime is 306134233. The reversal of 306134221 is 122431603.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 302272996 + 3861225 = 17386^2 + 1965^2 .

It is a cyclic number.

It is not a de Polignac number, because 306134221 - 2⁷ = 306134093 is a prime.

It is a super-2 number, since 2×306134221² = 187436322534553682, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 306134192 and 306134201.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (306134261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 153067110 + 153067111.

It is an arithmetic number, because the mean of its divisors is an integer number (153067111).

Almost surely, 2^306134221 is an apocalyptic number.

It is an amenable number.

306134221 is a deficient number, since it is larger than the sum of its proper divisors (1).

306134221 is an equidigital number, since it uses as much as digits as its factorization.

306134221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 22.

The square root of 306134221 is about 17496.6917158645. The cubic root of 306134221 is about 673.9649218478.

Adding to 306134221 its reverse (122431603), we get a palindrome (428565824).

The spelling of 306134221 in words is "three hundred six million, one hundred thirty-four thousand, two hundred twenty-one".