81198 has 24 divisors (see below), whose sum is σ = 190008. Its totient is φ = 24912.

The previous prime is 81197. The next prime is 81199. The reversal of 81198 is 89118.

It is an interprime number because it is at equal distance from previous prime (81197) and next prime (81199).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81197) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 61 + ... + 407.

It is an arithmetic number, because the mean of its divisors is an integer number (7917).

2⁸¹¹⁹⁸ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81198, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (95004).

81198 is an abundant number, since it is smaller than the sum of its proper divisors (108810).

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

81198 is a wasteful number, since it uses less digits than its factorization.

81198 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 368 (or 365 counting only the distinct ones).

The product of its digits is 576, while the sum is 27.

The square root of 81198 is about 284.9526276419. The cubic root of 81198 is about 43.3027134114.

Adding to 81198 its sum of digits (27), we get a square (81225 = 285²).

It can be divided in two parts, 811 and 98, that added together give a palindrome (909).

The spelling of 81198 in words is "eighty-one thousand, one hundred ninety-eight".