47831 has 4 divisors (see below), whose sum is σ = 54672. Its totient is φ = 40992.

The previous prime is 47819. The next prime is 47837. The reversal of 47831 is 13874.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 47831 - 2¹⁰ = 46807 is a prime.

It is a super-2 number, since 2×47831² = 4575609122, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 47797 and 47806.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (47837) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3410 + ... + 3423.

It is an arithmetic number, because the mean of its divisors is an integer number (13668).

2⁴⁷⁸³¹ is an apocalyptic number.

47831 is a deficient number, since it is larger than the sum of its proper divisors (6841).

47831 is an equidigital number, since it uses as much as digits as its factorization.

47831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6840.

The product of its digits is 672, while the sum is 23.

The square root of 47831 is about 218.7029949498. The cubic root of 47831 is about 36.2997098434.

It can be divided in two parts, 47 and 831, that added together give a palindrome (878).

The spelling of 47831 in words is "forty-seven thousand, eight hundred thirty-one".