161755 has 16 divisors (see below), whose sum is σ = 225504. Its totient is φ = 110080.

The previous prime is 161753. The next prime is 161761. The reversal of 161755 is 557161.

It is not a de Polignac number, because 161755 - 2¹ = 161753 is a prime.

It is an Ulam number.

It is a Duffinian number.

161755 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161753) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 849 + ... + 1021.

It is an arithmetic number, because the mean of its divisors is an integer number (14094).

2¹⁶¹⁷⁵⁵ is an apocalyptic number.

161755 is a deficient number, since it is larger than the sum of its proper divisors (63749).

161755 is a wasteful number, since it uses less digits than its factorization.

161755 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 206.

The product of its digits is 1050, while the sum is 25.

The square root of 161755 is about 402.1877670939. The cubic root of 161755 is about 54.4861227749.

It can be divided in two parts, 16 and 1755, that added together give a palindrome (1771).

The spelling of 161755 in words is "one hundred sixty-one thousand, seven hundred fifty-five".