19680161 has 2 divisors, whose sum is σ = 19680162. Its totient is φ = 19680160.

The previous prime is 19680151. The next prime is 19680163. The reversal of 19680161 is 16108691.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18835600 + 844561 = 4340^2 + 919^2 .

It is a cyclic number.

It is not a de Polignac number, because 19680161 - 2¹⁸ = 19418017 is a prime.

It is a Sophie Germain prime.

Together with 19680163, 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 (19680163) 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, 9840080 + 9840081.

It is an arithmetic number, because the mean of its divisors is an integer number (9840081).

Almost surely, 2^19680161 is an apocalyptic number.

It is an amenable number.

19680161 is a deficient number, since it is larger than the sum of its proper divisors (1).

19680161 is an equidigital number, since it uses as much as digits as its factorization.

19680161 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592, while the sum is 32.

The square root of 19680161 is about 4436.2327486281. The cubic root of 19680161 is about 269.9870181230.

The spelling of 19680161 in words is "nineteen million, six hundred eighty thousand, one hundred sixty-one".