191098 has 4 divisors (see below), whose sum is σ = 286650. Its totient is φ = 95548.

The previous prime is 191089. The next prime is 191099. The reversal of 191098 is 890191.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 890191 = 461 ⋅1931.

It can be written as a sum of positive squares in only one way, i.e., 157609 + 33489 = 397^2 + 183^2 .

It is not an unprimeable number, because it can be changed into a prime (191099) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 47773 + ... + 47776.

2¹⁹¹⁰⁹⁸ is an apocalyptic number.

191098 is a deficient number, since it is larger than the sum of its proper divisors (95552).

191098 is an equidigital number, since it uses as much as digits as its factorization.

191098 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95551.

The product of its (nonzero) digits is 648, while the sum is 28.

The square root of 191098 is about 437.1475723368. The cubic root of 191098 is about 57.5995000600.

The spelling of 191098 in words is "one hundred ninety-one thousand, ninety-eight".