30605681 has 2 divisors, whose sum is σ = 30605682. Its totient is φ = 30605680.

The previous prime is 30605671. The next prime is 30605683. The reversal of 30605681 is 18650603.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 29430625 + 1175056 = 5425^2 + 1084^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-30605681 is a prime.

It is a super-2 number, since 2×30605681² = 1873415418947522, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 30605683, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (30605683) 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, 15302840 + 15302841.

It is an arithmetic number, because the mean of its divisors is an integer number (15302841).

Almost surely, 2^30605681 is an apocalyptic number.

It is an amenable number.

30605681 is a deficient number, since it is larger than the sum of its proper divisors (1).

30605681 is an equidigital number, since it uses as much as digits as its factorization.

30605681 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 30605681 is about 5532.2401430162. The cubic root of 30605681 is about 312.8004355506.

The spelling of 30605681 in words is "thirty million, six hundred five thousand, six hundred eighty-one".