305129 has 4 divisors (see below), whose sum is σ = 332880. Its totient is φ = 277380.

The previous prime is 305119. The next prime is 305131. The reversal of 305129 is 921503.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 921503 = 11 ⋅83773.

It is a cyclic number.

It is not a de Polignac number, because 305129 - 2⁴ = 305113 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 305129.

It is not an unprimeable number, because it can be changed into a prime (305119) 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 3 ways as a sum of consecutive naturals, for example, 13859 + ... + 13880.

It is an arithmetic number, because the mean of its divisors is an integer number (83220).

2³⁰⁵¹²⁹ is an apocalyptic number.

It is an amenable number.

305129 is a deficient number, since it is larger than the sum of its proper divisors (27751).

305129 is a wasteful number, since it uses less digits than its factorization.

305129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27750.

The product of its (nonzero) digits is 270, while the sum is 20.

The square root of 305129 is about 552.3848296251. The cubic root of 305129 is about 67.3226436864.

It can be divided in two parts, 305 and 129, that added together give a palindrome (434).

The spelling of 305129 in words is "three hundred five thousand, one hundred twenty-nine".