71691 has 8 divisors (see below), whose sum is σ = 99840. Its totient is φ = 45672.

The previous prime is 71671. The next prime is 71693. The reversal of 71691 is 19617.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 71691 - 2⁷ = 71563 is a prime.

It is not an unprimeable number, because it can be changed into a prime (71693) 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, 451 + ... + 588.

It is an arithmetic number, because the mean of its divisors is an integer number (12480).

2⁷¹⁶⁹¹ is an apocalyptic number.

71691 is a deficient number, since it is larger than the sum of its proper divisors (28149).

71691 is a wasteful number, since it uses less digits than its factorization.

71691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1065.

The product of its digits is 378, while the sum is 24.

The square root of 71691 is about 267.7517506946. The cubic root of 71691 is about 41.5420776107.

It can be divided in two parts, 716 and 91, that multiplied together give a palindrome (65156).

The spelling of 71691 in words is "seventy-one thousand, six hundred ninety-one".