47491 has 2 divisors, whose sum is σ = 47492. Its totient is φ = 47490.

The previous prime is 47459. The next prime is 47497. The reversal of 47491 is 19474.

47491 is nontrivially palindromic in base 9.

47491 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 47491 - 2⁵ = 47459 is a prime.

It is equal to p₄₈₉₄ and since 47491 and 4894 have the same sum of digits, it is a Honaker prime.

It is a nialpdrome in base 15 and base 16.

It is not a weakly prime, because it can be changed into another prime (47497) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 23745 + 23746.

It is an arithmetic number, because the mean of its divisors is an integer number (23746).

2⁴⁷⁴⁹¹ is an apocalyptic number.

47491 is a deficient number, since it is larger than the sum of its proper divisors (1).

47491 is an equidigital number, since it uses as much as digits as its factorization.

47491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1008, while the sum is 25.

The square root of 47491 is about 217.9242987829. The cubic root of 47491 is about 36.2134947602.

It can be divided in two parts, 474 and 91, that multiplied together give a palindrome (43134).

The spelling of 47491 in words is "forty-seven thousand, four hundred ninety-one".