71109 has 6 divisors (see below), whose sum is σ = 102726. Its totient is φ = 47400.

The previous prime is 71089. The next prime is 71119. The reversal of 71109 is 90117.

It can be written as a sum of positive squares in only one way, i.e., 65025 + 6084 = 255^2 + 78^2 .

It is not a de Polignac number, because 71109 - 2⁷ = 70981 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 71091 and 71100.

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 polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3942 + ... + 3959.

It is an arithmetic number, because the mean of its divisors is an integer number (17121).

2⁷¹¹⁰⁹ is an apocalyptic number.

It is an amenable number.

71109 is a deficient number, since it is larger than the sum of its proper divisors (31617).

71109 is a wasteful number, since it uses less digits than its factorization.

71109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7907 (or 7904 counting only the distinct ones).

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

The square root of 71109 is about 266.6627083040. The cubic root of 71109 is about 41.4293567599.

The spelling of 71109 in words is "seventy-one thousand, one hundred nine".