161085191 has 2 divisors, whose sum is σ = 161085192. Its totient is φ = 161085190.

The previous prime is 161085167. The next prime is 161085209. The reversal of 161085191 is 191580161.

It is a strong prime.

It is an emirp because it is prime and its reverse (191580161) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 161085191 - 2¹⁰ = 161084167 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161085101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80542595 + 80542596.

It is an arithmetic number, because the mean of its divisors is an integer number (80542596).

Almost surely, 2^161085191 is an apocalyptic number.

161085191 is a deficient number, since it is larger than the sum of its proper divisors (1).

161085191 is an equidigital number, since it uses as much as digits as its factorization.

161085191 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2160, while the sum is 32.

The square root of 161085191 is about 12691.9340921705. The cubic root of 161085191 is about 544.1081178830.

The spelling of 161085191 in words is "one hundred sixty-one million, eighty-five thousand, one hundred ninety-one".