201911 has 2 divisors, whose sum is σ = 201912. Its totient is φ = 201910.

The previous prime is 201907. The next prime is 201919. The reversal of 201911 is 119102.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 201911 - 2² = 201907 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (201919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100955 + 100956.

It is an arithmetic number, because the mean of its divisors is an integer number (100956).

2²⁰¹⁹¹¹ is an apocalyptic number.

201911 is a deficient number, since it is larger than the sum of its proper divisors (1).

201911 is an equidigital number, since it uses as much as digits as its factorization.

201911 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18, while the sum is 14.

The square root of 201911 is about 449.3450789761. The cubic root of 201911 is about 58.6660245855. Note that the first 3 decimals are identical.

The spelling of 201911 in words is "two hundred one thousand, nine hundred eleven".