71091 has 8 divisors (see below), whose sum is σ = 105360. Its totient is φ = 47376.

The previous prime is 71089. The next prime is 71119. The reversal of 71091 is 19017.

It is not a de Polignac number, because 71091 - 2¹ = 71089 is a prime.

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (71011) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1290 + ... + 1343.

It is an arithmetic number, because the mean of its divisors is an integer number (13170).

2⁷¹⁰⁹¹ is an apocalyptic number.

71091 is a deficient number, since it is larger than the sum of its proper divisors (34269).

71091 is a wasteful number, since it uses less digits than its factorization.

71091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2642 (or 2636 counting only the distinct ones).

The product of its (nonzero) digits is 63, while the sum is 18.

The square root of 71091 is about 266.6289556669. The cubic root of 71091 is about 41.4258607592.

The spelling of 71091 in words is "seventy-one thousand, ninety-one".