71481 has 4 divisors (see below), whose sum is σ = 95312. Its totient is φ = 47652.

The previous prime is 71479. The next prime is 71483. The reversal of 71481 is 18417.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (71479) and next prime (71483).

It is not a de Polignac number, because 71481 - 2¹ = 71479 is a prime.

It is a super-2 number, since 2×71481² = 10219066722, which contains 22 as substring.

It is a D-number.

It is a Duffinian number.

It is a Curzon number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 71481.

It is not an unprimeable number, because it can be changed into a prime (71483) 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, 11911 + ... + 11916.

It is an arithmetic number, because the mean of its divisors is an integer number (23828).

2⁷¹⁴⁸¹ is an apocalyptic number.

It is an amenable number.

71481 is a deficient number, since it is larger than the sum of its proper divisors (23831).

71481 is a wasteful number, since it uses less digits than its factorization.

71481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23830.

The product of its digits is 224, while the sum is 21.

The square root of 71481 is about 267.3593087962. The cubic root of 71481 is about 41.5014757302.

Adding to 71481 its reverse (18417), we get a palindrome (89898).

The spelling of 71481 in words is "seventy-one thousand, four hundred eighty-one".