161391017 has 2 divisors, whose sum is σ = 161391018. Its totient is φ = 161391016.

The previous prime is 161391011. The next prime is 161391059. The reversal of 161391017 is 710193161.

161391017 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 131239936 + 30151081 = 11456^2 + 5491^2 .

It is an emirp because it is prime and its reverse (710193161) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 161391017 - 2²² = 157196713 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (161391011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80695508 + 80695509.

It is an arithmetic number, because the mean of its divisors is an integer number (80695509).

Almost surely, 2^161391017 is an apocalyptic number.

It is an amenable number.

161391017 is a deficient number, since it is larger than the sum of its proper divisors (1).

161391017 is an equidigital number, since it uses as much as digits as its factorization.

161391017 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1134, while the sum is 29.

The square root of 161391017 is about 12703.9764247262. The cubic root of 161391017 is about 544.4522364458.

The spelling of 161391017 in words is "one hundred sixty-one million, three hundred ninety-one thousand, seventeen".