306909961 has 2 divisors, whose sum is σ = 306909962. Its totient is φ = 306909960.

The previous prime is 306909949. The next prime is 306909979. The reversal of 306909961 is 169909603.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 287505936 + 19404025 = 16956^2 + 4405^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-306909961 is a prime.

It is a super-2 number, since 2×306909961² = 188387448322043042, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (306909461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 153454980 + 153454981.

It is an arithmetic number, because the mean of its divisors is an integer number (153454981).

Almost surely, 2^306909961 is an apocalyptic number.

It is an amenable number.

306909961 is a deficient number, since it is larger than the sum of its proper divisors (1).

306909961 is an equidigital number, since it uses as much as digits as its factorization.

306909961 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 78732, while the sum is 43.

The square root of 306909961 is about 17518.8458809363. The cubic root of 306909961 is about 674.5337143640.

The spelling of 306909961 in words is "three hundred six million, nine hundred nine thousand, nine hundred sixty-one".