27491 has 4 divisors (see below), whose sum is σ = 28272. Its totient is φ = 26712.

The previous prime is 27487. The next prime is 27509. The reversal of 27491 is 19472.

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 27491 - 2² = 27487 is a prime.

It is a Duffinian number.

It is a plaindrome in base 12.

It is a nialpdrome in base 8.

It is not an unprimeable number, because it can be changed into a prime (27431) 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, 335 + ... + 408.

It is an arithmetic number, because the mean of its divisors is an integer number (7068).

2²⁷⁴⁹¹ is an apocalyptic number.

27491 is a deficient number, since it is larger than the sum of its proper divisors (781).

27491 is an equidigital number, since it uses as much as digits as its factorization.

27491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 780.

The product of its digits is 504, while the sum is 23.

The square root of 27491 is about 165.8041012762. The cubic root of 27491 is about 30.1807605189.

The spelling of 27491 in words is "twenty-seven thousand, four hundred ninety-one".