47891 has 4 divisors (see below), whose sum is σ = 48552. Its totient is φ = 47232.

The previous prime is 47881. The next prime is 47903. The reversal of 47891 is 19874.

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 47891 - 2¹⁰ = 46867 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (47881) 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, 206 + ... + 371.

It is an arithmetic number, because the mean of its divisors is an integer number (12138).

2⁴⁷⁸⁹¹ is an apocalyptic number.

47891 is a deficient number, since it is larger than the sum of its proper divisors (661).

47891 is an equidigital number, since it uses as much as digits as its factorization.

47891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 660.

The product of its digits is 2016, while the sum is 29.

The square root of 47891 is about 218.8401242917. The cubic root of 47891 is about 36.3148818207.

The spelling of 47891 in words is "forty-seven thousand, eight hundred ninety-one".