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BaseRepresentation
bin110101101011001
31101200211
412231121
51334411
6331121
7143056
oct65531
941624
1027481
1119713
1213aa1
13c67c
14a02d
158221
hex6b59

27481 has 2 divisors, whose sum is σ = 27482. Its totient is φ = 27480.

The previous prime is 27479. The next prime is 27487. The reversal of 27481 is 18472.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27225 + 256 = 165^2 + 16^2 .

It is a cyclic number.

It is not a de Polignac number, because 27481 - 21 = 27479 is a prime.

It is a super-2 number, since 2×274812 = 1510410722, which contains 22 as substring.

Together with 27479, it forms a pair of twin primes.

It is a Chen prime.

It is a nialpdrome in base 8 and base 15.

It is not a weakly prime, because it can be changed into another prime (27487) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13740 + 13741.

It is an arithmetic number, because the mean of its divisors is an integer number (13741).

227481 is an apocalyptic number.

It is an amenable number.

27481 is a deficient number, since it is larger than the sum of its proper divisors (1).

27481 is an equidigital number, since it uses as much as digits as its factorization.

27481 is an odious number, because the sum of its binary digits is odd.

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

The square root of 27481 is about 165.7739424638. The cubic root of 27481 is about 30.1771006034.

Subtracting from 27481 its reverse (18472), we obtain a palindrome (9009).

The spelling of 27481 in words is "twenty-seven thousand, four hundred eighty-one".