30668161 has 2 divisors, whose sum is σ = 30668162. Its totient is φ = 30668160.

The previous prime is 30668137. The next prime is 30668171. The reversal of 30668161 is 16186603.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24443136 + 6225025 = 4944^2 + 2495^2 .

It is an emirp because it is prime and its reverse (16186603) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 30668161 - 2⁵ = 30668129 is a prime.

It is not a weakly prime, because it can be changed into another prime (30668171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15334080 + 15334081.

It is an arithmetic number, because the mean of its divisors is an integer number (15334081).

Almost surely, 2^30668161 is an apocalyptic number.

It is an amenable number.

30668161 is a deficient number, since it is larger than the sum of its proper divisors (1).

30668161 is an equidigital number, since it uses as much as digits as its factorization.

30668161 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 30668161 is about 5537.8841627466. The cubic root of 30668161 is about 313.0131464637.

The spelling of 30668161 in words is "thirty million, six hundred sixty-eight thousand, one hundred sixty-one".