161105 has 8 divisors (see below), whose sum is σ = 220992. Its totient is φ = 110448.

The previous prime is 161093. The next prime is 161123. The reversal of 161105 is 501161.

161105 = T₁₃₉ + T₁₄₀ + ... + T₁₅₃.

161105 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 161105 - 2¹⁰ = 160081 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 161105.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 161105.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2267 + ... + 2336.

It is an arithmetic number, because the mean of its divisors is an integer number (27624).

2¹⁶¹¹⁰⁵ is an apocalyptic number.

It is an amenable number.

161105 is a deficient number, since it is larger than the sum of its proper divisors (59887).

161105 is an equidigital number, since it uses as much as digits as its factorization.

161105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4615.

The product of its (nonzero) digits is 30, while the sum is 14.

The square root of 161105 is about 401.3788733852. The cubic root of 161105 is about 54.4130420359.

Adding to 161105 its reverse (501161), we get a palindrome (662266).

The spelling of 161105 in words is "one hundred sixty-one thousand, one hundred five".