200191 has 2 divisors, whose sum is σ = 200192. Its totient is φ = 200190.

The previous prime is 200183. The next prime is 200201. The reversal of 200191 is 191002.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 200191 - 2³ = 200183 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (200131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100095 + 100096.

It is an arithmetic number, because the mean of its divisors is an integer number (100096).

2²⁰⁰¹⁹¹ is an apocalyptic number.

200191 is a deficient number, since it is larger than the sum of its proper divisors (1).

200191 is an equidigital number, since it uses as much as digits as its factorization.

200191 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18, while the sum is 13.

The square root of 200191 is about 447.4270890324. The cubic root of 200191 is about 58.4989650875.

Adding to 200191 its reverse (191002), we get a palindrome (391193).

The spelling of 200191 in words is "two hundred thousand, one hundred ninety-one".