161798 has 24 divisors (see below), whose sum is σ = 306432. Its totient is φ = 63504.

The previous prime is 161783. The next prime is 161807. The reversal of 161798 is 897161.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

161798 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1211 + ... + 1337.

It is an arithmetic number, because the mean of its divisors is an integer number (12768).

2¹⁶¹⁷⁹⁸ is an apocalyptic number.

161798 is a deficient number, since it is larger than the sum of its proper divisors (144634).

161798 is a wasteful number, since it uses less digits than its factorization.

161798 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 156 (or 149 counting only the distinct ones).

The product of its digits is 3024, while the sum is 32.

The square root of 161798 is about 402.2412211596. The cubic root of 161798 is about 54.4909504375.

It can be divided in two parts, 161 and 798, that added together give a palindrome (959).

The spelling of 161798 in words is "one hundred sixty-one thousand, seven hundred ninety-eight".