161000 has 64 divisors (see below), whose sum is σ = 449280. Its totient is φ = 52800.

The previous prime is 160997. The next prime is 161009. The reversal of 161000 is 161.

161000 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (8).

It is a nialpdrome in base 11.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 161000.

It is not an unprimeable number, because it can be changed into a prime (161009) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6989 + ... + 7011.

It is an arithmetic number, because the mean of its divisors is an integer number (7020).

2¹⁶¹⁰⁰⁰ is an apocalyptic number.

161000 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 161000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (224640).

161000 is an abundant number, since it is smaller than the sum of its proper divisors (288280).

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

161000 is a wasteful number, since it uses less digits than its factorization.

161000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51 (or 37 counting only the distinct ones).

The product of its (nonzero) digits is 6, while the sum is 8.

The square root of 161000 is about 401.2480529548. The cubic root of 161000 is about 54.4012182541.

Adding to 161000 its reverse (161), we get a palindrome (161161).

161000 divided by its reverse (161) gives a cube (1000 = 10³).

The spelling of 161000 in words is "one hundred sixty-one thousand".