171091 has 2 divisors, whose sum is σ = 171092. Its totient is φ = 171090.

The previous prime is 171079. The next prime is 171103. The reversal of 171091 is 190171.

It is a happy number.

171091 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a balanced prime because it is at equal distance from previous prime (171079) and next prime (171103).

It is a cyclic number.

It is not a de Polignac number, because 171091 - 2⁹ = 170579 is a prime.

It is an Ulam number.

171091 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (171491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85545 + 85546.

It is an arithmetic number, because the mean of its divisors is an integer number (85546).

2¹⁷¹⁰⁹¹ is an apocalyptic number.

171091 is a deficient number, since it is larger than the sum of its proper divisors (1).

171091 is an equidigital number, since it uses as much as digits as its factorization.

171091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 63, while the sum is 19.

The square root of 171091 is about 413.6314784926. The cubic root of 171091 is about 55.5148351977.

The spelling of 171091 in words is "one hundred seventy-one thousand, ninety-one".