27109 has 2 divisors, whose sum is σ = 27110. Its totient is φ = 27108.
The previous prime is 27107. The next prime is 27127. The reversal of 27109 is 90172.
27109 is nontrivially palindromic in base 12.
It is a weak prime.
It can be written as a sum of positive squares in only one way, i.e., 21025 + 6084 = 145^2 + 78^2 .
It is a cyclic number.
It is not a de Polignac number, because 27109 - 21 = 27107 is a prime.
Together with 27107, it forms a pair of twin primes.
It is an Ulam number.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (27103) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13554 + 13555.
It is an arithmetic number, because the mean of its divisors is an integer number (13555).
227109 is an apocalyptic number.
It is an amenable number.
27109 is a deficient number, since it is larger than the sum of its proper divisors (1).
27109 is an equidigital number, since it uses as much as digits as its factorization.
27109 is an odious number, because the sum of its binary digits is odd.
The product of its (nonzero) digits is 126, while the sum is 19.
The square root of 27109 is about 164.6481096156. The cubic root of 27109 is about 30.0403161663.
It can be divided in two parts, 27 and 109, that added together give a triangular number (136 = T16).
The spelling of 27109 in words is "twenty-seven thousand, one hundred nine".
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