200091 has 4 divisors (see below), whose sum is σ = 266792. Its totient is φ = 133392.

The previous prime is 200087. The next prime is 200117. The reversal of 200091 is 190002.

It is a happy number.

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

It is not a de Polignac number, because 200091 - 2² = 200087 is a prime.

It is a D-number.

It is a Duffinian number.

200091 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (200041) 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, 33346 + ... + 33351.

It is an arithmetic number, because the mean of its divisors is an integer number (66698).

2²⁰⁰⁰⁹¹ is an apocalyptic number.

200091 is a deficient number, since it is larger than the sum of its proper divisors (66701).

200091 is an equidigital number, since it uses as much as digits as its factorization.

200091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66700.

The product of its (nonzero) digits is 18, while the sum is 12.

The square root of 200091 is about 447.3153250225. The cubic root of 200091 is about 58.4892229399.

Adding to 200091 its reverse (190002), we get a palindrome (390093).

The spelling of 200091 in words is "two hundred thousand, ninety-one".