711391 has 4 divisors (see below), whose sum is σ = 728784. Its totient is φ = 694000.

The previous prime is 711371. The next prime is 711397. The reversal of 711391 is 193117.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 193117 = 113 ⋅1709.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-711391 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (711397) 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, 8635 + ... + 8716.

It is an arithmetic number, because the mean of its divisors is an integer number (182196).

2⁷¹¹³⁹¹ is an apocalyptic number.

711391 is a deficient number, since it is larger than the sum of its proper divisors (17393).

711391 is a wasteful number, since it uses less digits than its factorization.

711391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17392.

The product of its digits is 189, while the sum is 22.

The square root of 711391 is about 843.4399800816. The cubic root of 711391 is about 89.2694355694.

The spelling of 711391 in words is "seven hundred eleven thousand, three hundred ninety-one".