305109 has 24 divisors (see below), whose sum is σ = 524160. Its totient is φ = 167328.

The previous prime is 305101. The next prime is 305111. The reversal of 305109 is 901503.

It is not a de Polignac number, because 305109 - 2³ = 305101 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 305091 and 305100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (305101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1744 + ... + 1910.

It is an arithmetic number, because the mean of its divisors is an integer number (21840).

2³⁰⁵¹⁰⁹ is an apocalyptic number.

It is an amenable number.

305109 is a deficient number, since it is larger than the sum of its proper divisors (219051).

305109 is a wasteful number, since it uses less digits than its factorization.

305109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 209 (or 206 counting only the distinct ones).

The product of its (nonzero) digits is 135, while the sum is 18.

The square root of 305109 is about 552.3667260073. The cubic root of 305109 is about 67.3211727432.

It can be divided in two parts, 305 and 109, that added together give a palindrome (414).

The spelling of 305109 in words is "three hundred five thousand, one hundred nine".