71189 has 4 divisors (see below), whose sum is σ = 71724. Its totient is φ = 70656.

The previous prime is 71171. The next prime is 71191. The reversal of 71189 is 98117.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 98117 = 59 ⋅1663.

It can be written as a sum of positive squares in 2 ways, for example, as 46225 + 24964 = 215^2 + 158^2 .

It is a cyclic number.

It is not a de Polignac number, because 71189 - 2¹⁶ = 5653 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 (71119) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 119 + ... + 395.

It is an arithmetic number, because the mean of its divisors is an integer number (17931).

2⁷¹¹⁸⁹ is an apocalyptic number.

It is an amenable number.

71189 is a deficient number, since it is larger than the sum of its proper divisors (535).

71189 is a wasteful number, since it uses less digits than its factorization.

71189 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 534.

The product of its digits is 504, while the sum is 26.

The square root of 71189 is about 266.8126683649. The cubic root of 71189 is about 41.4448874072. Note that the first 3 decimals are identical.

The spelling of 71189 in words is "seventy-one thousand, one hundred eighty-nine".