161850 has 48 divisors (see below), whose sum is σ = 437472. Its totient is φ = 39360.

The previous prime is 161839. The next prime is 161869. The reversal of 161850 is 58161.

161850 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an alternating number because its digits alternate between odd and even.

It is an unprimeable number.

161850 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1909 + ... + 1991.

It is an arithmetic number, because the mean of its divisors is an integer number (9114).

2¹⁶¹⁸⁵⁰ is an apocalyptic number.

161850 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 161850, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (218736).

161850 is an abundant number, since it is smaller than the sum of its proper divisors (275622).

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

161850 is a wasteful number, since it uses less digits than its factorization.

161850 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111 (or 106 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 21.

The square root of 161850 is about 402.3058537978. The cubic root of 161850 is about 54.4967873987.

The spelling of 161850 in words is "one hundred sixty-one thousand, eight hundred fifty".