198491 has 2 divisors, whose sum is σ = 198492. Its totient is φ = 198490.

The previous prime is 198479. The next prime is 198503. The reversal of 198491 is 194891.

It is a balanced prime because it is at equal distance from previous prime (198479) and next prime (198503).

It is an emirp because it is prime and its reverse (194891) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 198491 - 2⁶ = 198427 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (198461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99245 + 99246.

It is an arithmetic number, because the mean of its divisors is an integer number (99246).

2¹⁹⁸⁴⁹¹ is an apocalyptic number.

198491 is a deficient number, since it is larger than the sum of its proper divisors (1).

198491 is an equidigital number, since it uses as much as digits as its factorization.

198491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2592, while the sum is 32.

The square root of 198491 is about 445.5232878313. The cubic root of 198491 is about 58.3329052123.

Subtracting from 198491 its reverse (194891), we obtain a square (3600 = 60²).

The spelling of 198491 in words is "one hundred ninety-eight thousand, four hundred ninety-one".