51109 has 2 divisors, whose sum is σ = 51110.
Its totient is φ = 51108.
The previous prime is 51071. The next prime is 51131. The reversal of 51109 is 90115.
It is a strong prime.
It can be written as a sum of positive squares in only one way, i.e., 50625 + 484 = 225^2 + 22^2
It is a cyclic number.
It is not a de Polignac number, because 51109 - 215 = 18341 is a prime.
It is a super-2 number, since 2×511092 = 5224259762, which contains 22 as substring.
It is a junction number, because it is equal to n+sod(n) for n = 51092 and 51101.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (51169) 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, 25554 + 25555.
It is an arithmetic number, because the mean of its divisors is an integer number (25555).
251109 is an apocalyptic number.
It is an amenable number.
51109 is a deficient number, since it is larger than the sum of its proper divisors (1).
51109 is an equidigital number, since it uses as much as digits as its factorization.
51109 is an odious number, because the sum of its binary digits is odd.
The product of its (nonzero) digits is 45, while the sum is 16.
The square root of 51109 is about 226.0729970607.
The cubic root of 51109 is about 37.1106984256.
The spelling of 51109 in words is "fifty-one thousand, one hundred nine".