71911 has 4 divisors (see below), whose sum is σ = 82192. Its totient is φ = 61632.

The previous prime is 71909. The next prime is 71917. The reversal of 71911 is 11917.

It is a happy number.

71911 is nontrivially palindromic in base 3.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11917 = 17 ⋅701.

It is a cyclic number.

It is not a de Polignac number, because 71911 - 2¹ = 71909 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71917) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5130 + ... + 5143.

It is an arithmetic number, because the mean of its divisors is an integer number (20548).

2⁷¹⁹¹¹ is an apocalyptic number.

71911 is a deficient number, since it is larger than the sum of its proper divisors (10281).

71911 is a wasteful number, since it uses less digits than its factorization.

71911 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10280.

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

The square root of 71911 is about 268.1622643102. The cubic root of 71911 is about 41.5845279618.

The spelling of 71911 in words is "seventy-one thousand, nine hundred eleven".