198155 has 4 divisors (see below), whose sum is σ = 237792. Its totient is φ = 158520.

The previous prime is 198139. The next prime is 198173. The reversal of 198155 is 551891.

198155 = T₂₅₄ + T₂₅₅ + ... + T₂₅₉.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 551891 = 647 ⋅853.

It is not a de Polignac number, because 198155 - 2⁴ = 198139 is a prime.

It is a Duffinian number.

It is an unprimeable 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 3 ways as a sum of consecutive naturals, for example, 19811 + ... + 19820.

It is an arithmetic number, because the mean of its divisors is an integer number (59448).

2¹⁹⁸¹⁵⁵ is an apocalyptic number.

198155 is a deficient number, since it is larger than the sum of its proper divisors (39637).

198155 is an equidigital number, since it uses as much as digits as its factorization.

198155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39636.

The product of its digits is 1800, while the sum is 29.

The square root of 198155 is about 445.1460434509. The cubic root of 198155 is about 58.2999718535.

It can be divided in two parts, 198 and 155, that added together give a palindrome (353).

The spelling of 198155 in words is "one hundred ninety-eight thousand, one hundred fifty-five".