71231 has 8 divisors (see below), whose sum is σ = 78720. Its totient is φ = 64152.

The previous prime is 71209. The next prime is 71233. The reversal of 71231 is 13217.

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 71231 - 2⁶ = 71167 is a prime.

It is a super-2 number, since 2×71231² = 10147710722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71233) 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, 356 + ... + 518.

It is an arithmetic number, because the mean of its divisors is an integer number (9840).

2⁷¹²³¹ is an apocalyptic number.

71231 is a deficient number, since it is larger than the sum of its proper divisors (7489).

71231 is a wasteful number, since it uses less digits than its factorization.

71231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 205.

The product of its digits is 42, while the sum is 14.

The square root of 71231 is about 266.8913636669. The cubic root of 71231 is about 41.4530363397.

Subtracting from 71231 its sum of digits (14), we obtain a palindrome (71217).

Adding to 71231 its reverse (13217), we get a palindrome (84448).

The spelling of 71231 in words is "seventy-one thousand, two hundred thirty-one".