305061661 has 2 divisors, whose sum is σ = 305061662. Its totient is φ = 305061660.

The previous prime is 305061649. The next prime is 305061677. The reversal of 305061661 is 166160503.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 287472025 + 17589636 = 16955^2 + 4194^2 .

It is an emirp because it is prime and its reverse (166160503) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 305061661 - 2⁵ = 305061629 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (305061641) 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, 152530830 + 152530831.

It is an arithmetic number, because the mean of its divisors is an integer number (152530831).

Almost surely, 2^305061661 is an apocalyptic number.

It is an amenable number.

305061661 is a deficient number, since it is larger than the sum of its proper divisors (1).

305061661 is an equidigital number, since it uses as much as digits as its factorization.

305061661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3240, while the sum is 28.

The square root of 305061661 is about 17466.0144566527. The cubic root of 305061661 is about 673.1769083798.

The spelling of 305061661 in words is "three hundred five million, sixty-one thousand, six hundred sixty-one".