16091 has 2 divisors, whose sum is σ = 16092. Its totient is φ = 16090.

The previous prime is 16087. The next prime is 16097. The reversal of 16091 is 19061.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 16091 - 2² = 16087 is a prime.

It is a Sophie Germain prime.

It is an Ulam number.

16091 is a strobogrammatic number because it is the same when read upside-down.

It is not a weakly prime, because it can be changed into another prime (16097) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8045 + 8046.

It is an arithmetic number, because the mean of its divisors is an integer number (8046).

2¹⁶⁰⁹¹ is an apocalyptic number.

16091 is a deficient number, since it is larger than the sum of its proper divisors (1).

16091 is an equidigital number, since it uses as much as digits as its factorization.

16091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 54, while the sum is 17.

The square root of 16091 is about 126.8503054785. The cubic root of 16091 is about 25.2461027217.

The spelling of 16091 in words is "sixteen thousand, ninety-one".