71431 has 4 divisors (see below), whose sum is σ = 72664. Its totient is φ = 70200.

The previous prime is 71429. The next prime is 71437. The reversal of 71431 is 13417.

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 71431 - 2¹ = 71429 is a prime.

It is a super-2 number, since 2×71431² = 10204775522, which contains 22 as substring.

It is a Duffinian number.

71431 is a lucky number.

It is a plaindrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71437) 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, 525 + ... + 646.

It is an arithmetic number, because the mean of its divisors is an integer number (18166).

2⁷¹⁴³¹ is an apocalyptic number.

71431 is a deficient number, since it is larger than the sum of its proper divisors (1233).

71431 is a wasteful number, since it uses less digits than its factorization.

71431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1232.

The product of its digits is 84, while the sum is 16.

The square root of 71431 is about 267.2657853149. The cubic root of 71431 is about 41.4917968980.

Adding to 71431 its reverse (13417), we get a palindrome (84848).

The spelling of 71431 in words is "seventy-one thousand, four hundred thirty-one".