201791 has 2 divisors, whose sum is σ = 201792. Its totient is φ = 201790.

The previous prime is 201787. The next prime is 201797. The reversal of 201791 is 197102.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 201791 - 2² = 201787 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 (201797) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100895 + 100896.

It is an arithmetic number, because the mean of its divisors is an integer number (100896).

2²⁰¹⁷⁹¹ is an apocalyptic number.

201791 is a deficient number, since it is larger than the sum of its proper divisors (1).

201791 is an equidigital number, since it uses as much as digits as its factorization.

201791 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 126, while the sum is 20.

The square root of 201791 is about 449.2115314637. The cubic root of 201791 is about 58.6544001271.

Adding to 201791 its reverse (197102), we get a palindrome (398893).

The spelling of 201791 in words is "two hundred one thousand, seven hundred ninety-one".