2180120161 has 2 divisors, whose sum is σ = 2180120162. Its totient is φ = 2180120160.

The previous prime is 2180120147. The next prime is 2180120197. The reversal of 2180120161 is 1610210812.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1950900561 + 229219600 = 44169^2 + 15140^2 .

It is a cyclic number.

It is not a de Polignac number, because 2180120161 - 2²¹ = 2178023009 is a prime.

It is not a weakly prime, because it can be changed into another prime (2180120141) 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, 1090060080 + 1090060081.

It is an arithmetic number, because the mean of its divisors is an integer number (1090060081).

Almost surely, 2^2180120161 is an apocalyptic number.

It is an amenable number.

2180120161 is a deficient number, since it is larger than the sum of its proper divisors (1).

2180120161 is an equidigital number, since it uses as much as digits as its factorization.

2180120161 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 192, while the sum is 22.

The square root of 2180120161 is about 46691.7568849149. The cubic root of 2180120161 is about 1296.6620799844.

Adding to 2180120161 its reverse (1610210812), we get a palindrome (3790330973).

The spelling of 2180120161 in words is "two billion, one hundred eighty million, one hundred twenty thousand, one hundred sixty-one".