198751 has 4 divisors (see below), whose sum is σ = 227152. Its totient is φ = 170352.

The previous prime is 198733. The next prime is 198761. The reversal of 198751 is 157891.

198751 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 157891 = 41 ⋅3851.

It is not a de Polignac number, because 198751 - 2⁵ = 198719 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198701) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14190 + ... + 14203.

It is an arithmetic number, because the mean of its divisors is an integer number (56788).

2¹⁹⁸⁷⁵¹ is an apocalyptic number.

198751 is a deficient number, since it is larger than the sum of its proper divisors (28401).

198751 is an equidigital number, since it uses as much as digits as its factorization.

198751 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28400.

The product of its digits is 2520, while the sum is 31.

The square root of 198751 is about 445.8149840461. The cubic root of 198751 is about 58.3583638612.

It can be divided in two parts, 198 and 751, that added together give a palindrome (949).

The spelling of 198751 in words is "one hundred ninety-eight thousand, seven hundred fifty-one".