306047681 has 2 divisors, whose sum is σ = 306047682. Its totient is φ = 306047680.

The previous prime is 306047663. The next prime is 306047699. The reversal of 306047681 is 186740603.

It is a balanced prime because it is at equal distance from previous prime (306047663) and next prime (306047699).

It can be written as a sum of positive squares in only one way, i.e., 292239025 + 13808656 = 17095^2 + 3716^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-306047681 is a prime.

It is a super-2 number, since 2×306047681² = 187330366090955522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (306047381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 153023840 + 153023841.

It is an arithmetic number, because the mean of its divisors is an integer number (153023841).

Almost surely, 2^306047681 is an apocalyptic number.

It is an amenable number.

306047681 is a deficient number, since it is larger than the sum of its proper divisors (1).

306047681 is an equidigital number, since it uses as much as digits as its factorization.

306047681 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24192, while the sum is 35.

The square root of 306047681 is about 17494.2185021224. The cubic root of 306047681 is about 673.9014089428.

The spelling of 306047681 in words is "three hundred six million, forty-seven thousand, six hundred eighty-one".