55109 has 2 divisors, whose sum is σ = 55110.
Its totient is φ = 55108.
The previous prime is 55103. The next prime is 55117. The reversal of 55109 is 90155.
It is a weak prime.
It can be written as a sum of positive squares in only one way, i.e., 52900 + 2209 = 230^2 + 47^2
It is a cyclic number.
It is a de Polignac number, because none of the positive numbers 2k-55109 is a prime.
It is a Chen prime.
It is a plaindrome in base 15.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (55103) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27554 + 27555.
It is an arithmetic number, because the mean of its divisors is an integer number (27555).
255109 is an apocalyptic number.
It is an amenable number.
55109 is a deficient number, since it is larger than the sum of its proper divisors (1).
55109 is an equidigital number, since it uses as much as digits as its factorization.
55109 is an odious number, because the sum of its binary digits is odd.
The product of its (nonzero) digits is 225, while the sum is 20.
The square root of 55109 is about 234.7530617479.
The cubic root of 55109 is about 38.0546305642.
It can be divided in two parts, 55 and 109, that multiplied together give a palindrome (5995).
The spelling of 55109 in words is "fifty-five thousand, one hundred nine".