161320 has 32 divisors (see below), whose sum is σ = 376200. Its totient is φ = 62208.

The previous prime is 161309. The next prime is 161323. The reversal of 161320 is 23161.

It can be written as a sum of positive squares in 4 ways, for example, as 158404 + 2916 = 398^2 + 54^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 161320.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161323) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1426 + ... + 1534.

2¹⁶¹³²⁰ is an apocalyptic number.

161320 is a gapful number since it is divisible by the number (10) 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 161320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (188100).

161320 is an abundant number, since it is smaller than the sum of its proper divisors (214880).

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

161320 is a wasteful number, since it uses less digits than its factorization.

161320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 157 (or 153 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 13.

The square root of 161320 is about 401.6466108409. The cubic root of 161320 is about 54.4372366166.

Adding to 161320 its reverse (23161), we get a palindrome (184481).

The spelling of 161320 in words is "one hundred sixty-one thousand, three hundred twenty".