181198 has 4 divisors (see below), whose sum is σ = 271800. Its totient is φ = 90598.

The previous prime is 181193. The next prime is 181199. The reversal of 181198 is 891181.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 891181 = 23 ⋅38747.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (181193) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45298 + ... + 45301.

It is an arithmetic number, because the mean of its divisors is an integer number (67950).

2¹⁸¹¹⁹⁸ is an apocalyptic number.

181198 is a deficient number, since it is larger than the sum of its proper divisors (90602).

181198 is an equidigital number, since it uses as much as digits as its factorization.

181198 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90601.

The product of its digits is 576, while the sum is 28.

The square root of 181198 is about 425.6735838644. The cubic root of 181198 is about 56.5871472104.

The spelling of 181198 in words is "one hundred eighty-one thousand, one hundred ninety-eight".