161964017 has 2 divisors, whose sum is σ = 161964018. Its totient is φ = 161964016.

The previous prime is 161964007. The next prime is 161964029. The reversal of 161964017 is 710469161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 111851776 + 50112241 = 10576^2 + 7079^2 .

It is an emirp because it is prime and its reverse (710469161) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 161964017 - 2¹⁰ = 161962993 is a prime.

It is not a weakly prime, because it can be changed into another prime (161964007) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80982008 + 80982009.

It is an arithmetic number, because the mean of its divisors is an integer number (80982009).

Almost surely, 2^161964017 is an apocalyptic number.

It is an amenable number.

161964017 is a deficient number, since it is larger than the sum of its proper divisors (1).

161964017 is an equidigital number, since it uses as much as digits as its factorization.

161964017 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9072, while the sum is 35.

The square root of 161964017 is about 12726.5084371166. The cubic root of 161964017 is about 545.0958134719.

The spelling of 161964017 in words is "one hundred sixty-one million, nine hundred sixty-four thousand, seventeen".