189161185 has 4 divisors (see below), whose sum is σ = 226993428. Its totient is φ = 151328944.

The previous prime is 189161123. The next prime is 189161201. The reversal of 189161185 is 581161981.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 581161981 = 131 ⋅4436351.

It can be written as a sum of positive squares in 2 ways, for example, as 65351056 + 123810129 = 8084^2 + 11127^2 .

It is a cyclic number.

It is not a de Polignac number, because 189161185 - 2¹¹ = 189159137 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

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, 18916114 + ... + 18916123.

It is an arithmetic number, because the mean of its divisors is an integer number (56748357).

Almost surely, 2^189161185 is an apocalyptic number.

It is an amenable number.

189161185 is a deficient number, since it is larger than the sum of its proper divisors (37832243).

189161185 is an equidigital number, since it uses as much as digits as its factorization.

189161185 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37832242.

The product of its digits is 17280, while the sum is 40.

The square root of 189161185 is about 13753.5880772982. The cubic root of 189161185 is about 574.0424491182.

The spelling of 189161185 in words is "one hundred eighty-nine million, one hundred sixty-one thousand, one hundred eighty-five".