161085185 has 4 divisors (see below), whose sum is σ = 193302228. Its totient is φ = 128868144.

The previous prime is 161085167. The next prime is 161085191. The reversal of 161085185 is 581580161.

161085185 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 581580161 = 61 ⋅9534101.

It can be written as a sum of positive squares in 2 ways, for example, as 98089216 + 62995969 = 9904^2 + 7937^2 .

It is a cyclic number.

It is not a de Polignac number, because 161085185 - 2⁸ = 161084929 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16108514 + ... + 16108523.

It is an arithmetic number, because the mean of its divisors is an integer number (48325557).

Almost surely, 2^161085185 is an apocalyptic number.

It is an amenable number.

161085185 is a deficient number, since it is larger than the sum of its proper divisors (32217043).

161085185 is an equidigital number, since it uses as much as digits as its factorization.

161085185 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32217042.

The product of its (nonzero) digits is 9600, while the sum is 35.

The square root of 161085185 is about 12691.9338557999. The cubic root of 161085185 is about 544.1081111275.

The spelling of 161085185 in words is "one hundred sixty-one million, eighty-five thousand, one hundred eighty-five".