47281 has 4 divisors (see below), whose sum is σ = 50932. Its totient is φ = 43632.

The previous prime is 47279. The next prime is 47287. The reversal of 47281 is 18274.

47281 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18274 = 2 ⋅9137.

It can be written as a sum of positive squares in 2 ways, for example, as 3600 + 43681 = 60^2 + 209^2 .

It is a cyclic number.

It is not a de Polignac number, because 47281 - 2¹ = 47279 is a prime.

It is a super-2 number, since 2×47281² = 4470985922, which contains 22 as substring.

It is a Duffinian number.

47281 is a lucky number.

It is a plaindrome in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (47287) 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, 1806 + ... + 1831.

It is an arithmetic number, because the mean of its divisors is an integer number (12733).

2⁴⁷²⁸¹ is an apocalyptic number.

It is an amenable number.

47281 is a deficient number, since it is larger than the sum of its proper divisors (3651).

47281 is a wasteful number, since it uses less digits than its factorization.

47281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3650.

The product of its digits is 448, while the sum is 22.

The square root of 47281 is about 217.4419462753. The cubic root of 47281 is about 36.1600385210.

The spelling of 47281 in words is "forty-seven thousand, two hundred eighty-one".