120720161 has 2 divisors, whose sum is σ = 120720162. Its totient is φ = 120720160.

The previous prime is 120720151. The next prime is 120720181. The reversal of 120720161 is 161027021.

It is an a-pointer prime, because the next prime (120720181) can be obtained adding 120720161 to its sum of digits (20).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 105165025 + 15555136 = 10255^2 + 3944^2 .

It is an emirp because it is prime and its reverse (161027021) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 120720161 - 2¹⁸ = 120458017 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (120720101) 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, 60360080 + 60360081.

It is an arithmetic number, because the mean of its divisors is an integer number (60360081).

Almost surely, 2^120720161 is an apocalyptic number.

It is an amenable number.

120720161 is a deficient number, since it is larger than the sum of its proper divisors (1).

120720161 is an equidigital number, since it uses as much as digits as its factorization.

120720161 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 168, while the sum is 20.

The square root of 120720161 is about 10987.2726825177. The cubic root of 120720161 is about 494.2271529874.

Adding to 120720161 its reverse (161027021), we get a palindrome (281747182).

The spelling of 120720161 in words is "one hundred twenty million, seven hundred twenty thousand, one hundred sixty-one".