161172 has 54 divisors (see below), whose sum is σ = 459914. Its totient is φ = 47520.

The previous prime is 161167. The next prime is 161201. The reversal of 161172 is 271161.

161172 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 156816 + 4356 = 396^2 + 66^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 4338 + ... + 4374.

2¹⁶¹¹⁷² is an apocalyptic number.

161172 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 161172, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (229957).

161172 is an abundant number, since it is smaller than the sum of its proper divisors (298742).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

161172 is a wasteful number, since it uses less digits than its factorization.

161172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69 (or 53 counting only the distinct ones).

The product of its digits is 84, while the sum is 18.

The square root of 161172 is about 401.4623269997. The cubic root of 161172 is about 54.4205840500.

It can be divided in two parts, 161 and 172, that added together give a palindrome (333).

The spelling of 161172 in words is "one hundred sixty-one thousand, one hundred seventy-two".