188210161 has 2 divisors, whose sum is σ = 188210162. Its totient is φ = 188210160.

The previous prime is 188210159. The next prime is 188210221. The reversal of 188210161 is 161012881.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 187169761 + 1040400 = 13681^2 + 1020^2 .

It is a cyclic number.

It is not a de Polignac number, because 188210161 - 2¹ = 188210159 is a prime.

Together with 188210159, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (188214161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94105080 + 94105081.

It is an arithmetic number, because the mean of its divisors is an integer number (94105081).

Almost surely, 2^188210161 is an apocalyptic number.

It is an amenable number.

188210161 is a deficient number, since it is larger than the sum of its proper divisors (1).

188210161 is an equidigital number, since it uses as much as digits as its factorization.

188210161 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 768, while the sum is 28.

The square root of 188210161 is about 13718.9708433249. The cubic root of 188210161 is about 573.0788165945.

The spelling of 188210161 in words is "one hundred eighty-eight million, two hundred ten thousand, one hundred sixty-one".