161361217 has 2 divisors, whose sum is σ = 161361218. Its totient is φ = 161361216.

The previous prime is 161361173. The next prime is 161361227. The reversal of 161361217 is 712163161.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 151880976 + 9480241 = 12324^2 + 3079^2 .

It is a cyclic number.

It is not a de Polignac number, because 161361217 - 2¹¹ = 161359169 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (161361227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80680608 + 80680609.

It is an arithmetic number, because the mean of its divisors is an integer number (80680609).

Almost surely, 2^161361217 is an apocalyptic number.

It is an amenable number.

161361217 is a deficient number, since it is larger than the sum of its proper divisors (1).

161361217 is an equidigital number, since it uses as much as digits as its factorization.

161361217 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1512, while the sum is 28.

The square root of 161361217 is about 12702.8035094620. The cubic root of 161361217 is about 544.4187243052.

The spelling of 161361217 in words is "one hundred sixty-one million, three hundred sixty-one thousand, two hundred seventeen".