71031 has 4 divisors (see below), whose sum is σ = 94712. Its totient is φ = 47352.

The previous prime is 71023. The next prime is 71039. The reversal of 71031 is 13017.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13017 = 3 ⋅4339.

It is an interprime number because it is at equal distance from previous prime (71023) and next prime (71039).

It is not a de Polignac number, because 71031 - 2³ = 71023 is a prime.

It is a super-2 number, since 2×71031² = 10090805922, which contains 22 as substring.

It is a D-number.

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 = 70998 and 71016.

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 71031.

It is not an unprimeable number, because it can be changed into a prime (71039) 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, 11836 + ... + 11841.

It is an arithmetic number, because the mean of its divisors is an integer number (23678).

2⁷¹⁰³¹ is an apocalyptic number.

71031 is a deficient number, since it is larger than the sum of its proper divisors (23681).

71031 is a wasteful number, since it uses less digits than its factorization.

71031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23680.

The product of its (nonzero) digits is 21, while the sum is 12.

The square root of 71031 is about 266.5164160047. The cubic root of 71031 is about 41.4142031596.

Adding to 71031 its reverse (13017), we get a palindrome (84048).

It can be divided in two parts, 710 and 31, that added together give a triangular number (741 = T₃₈).

The spelling of 71031 in words is "seventy-one thousand, thirty-one".