161000197 has 2 divisors, whose sum is σ = 161000198. Its totient is φ = 161000196.

The previous prime is 161000173. The next prime is 161000219. The reversal of 161000197 is 791000161.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 154604356 + 6395841 = 12434^2 + 2529^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161000197 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161000117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80500098 + 80500099.

It is an arithmetic number, because the mean of its divisors is an integer number (80500099).

Almost surely, 2^161000197 is an apocalyptic number.

It is an amenable number.

161000197 is a deficient number, since it is larger than the sum of its proper divisors (1).

161000197 is an equidigital number, since it uses as much as digits as its factorization.

161000197 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 378, while the sum is 25.

The square root of 161000197 is about 12688.5853033346. The cubic root of 161000197 is about 544.0124044263.

The spelling of 161000197 in words is "one hundred sixty-one million, one hundred ninety-seven", and thus it is an aban number.