71391 has 8 divisors (see below), whose sum is σ = 97200. Its totient is φ = 46592.

The previous prime is 71389. The next prime is 71399. The reversal of 71391 is 19317.

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

It is a cyclic number.

It is not a de Polignac number, because 71391 - 2¹ = 71389 is a prime.

It is a plaindrome in base 16.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 71391.

It is not an unprimeable number, because it can be changed into a prime (71399) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 66 + ... + 383.

It is an arithmetic number, because the mean of its divisors is an integer number (12150).

2⁷¹³⁹¹ is an apocalyptic number.

71391 is a deficient number, since it is larger than the sum of its proper divisors (25809).

71391 is a wasteful number, since it uses less digits than its factorization.

71391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 505.

The product of its digits is 189, while the sum is 21.

The square root of 71391 is about 267.1909429603. The cubic root of 71391 is about 41.4840505798.

It can be divided in two parts, 7139 and 1, that added together give a triangular number (7140 = T₁₁₉).

The spelling of 71391 in words is "seventy-one thousand, three hundred ninety-one".