197191 has 4 divisors (see below), whose sum is σ = 203584. Its totient is φ = 190800.

The previous prime is 197161. The next prime is 197203. The reversal of 197191 is 191791.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 197191 - 2⁵ = 197159 is a prime.

It is a Duffinian number.

197191 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (197101) by changing a digit.

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, 3150 + ... + 3211.

It is an arithmetic number, because the mean of its divisors is an integer number (50896).

2¹⁹⁷¹⁹¹ is an apocalyptic number.

197191 is a deficient number, since it is larger than the sum of its proper divisors (6393).

197191 is an equidigital number, since it uses as much as digits as its factorization.

197191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6392.

The product of its digits is 567, while the sum is 28.

The square root of 197191 is about 444.0619326175. The cubic root of 197191 is about 58.2052773681.

The spelling of 197191 in words is "one hundred ninety-seven thousand, one hundred ninety-one".