71311 has 4 divisors (see below), whose sum is σ = 73800. Its totient is φ = 68824.

The previous prime is 71293. The next prime is 71317. The reversal of 71311 is 11317.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 71311 - 2¹¹ = 69263 is a prime.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a junction number, because it is equal to n+sod(n) for n = 71291 and 71300.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71317) 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, 1201 + ... + 1258.

It is an arithmetic number, because the mean of its divisors is an integer number (18450).

2⁷¹³¹¹ is an apocalyptic number.

71311 is a deficient number, since it is larger than the sum of its proper divisors (2489).

71311 is a wasteful number, since it uses less digits than its factorization.

71311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2488.

The product of its digits is 21, while the sum is 13.

The square root of 71311 is about 267.0411953239. The cubic root of 71311 is about 41.4685492586.

Adding to 71311 its reverse (11317), we get a palindrome (82628).

The spelling of 71311 in words is "seventy-one thousand, three hundred eleven", and thus it is an iban number.