305149 has 4 divisors (see below), whose sum is σ = 328636. Its totient is φ = 281664.

The previous prime is 305147. The next prime is 305209. The reversal of 305149 is 941503.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 196249 + 108900 = 443^2 + 330^2 .

It is a cyclic number.

It is not a de Polignac number, because 305149 - 2¹ = 305147 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (305143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11724 + ... + 11749.

It is an arithmetic number, because the mean of its divisors is an integer number (82159).

2³⁰⁵¹⁴⁹ is an apocalyptic number.

It is an amenable number.

305149 is a deficient number, since it is larger than the sum of its proper divisors (23487).

305149 is a wasteful number, since it uses less digits than its factorization.

305149 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23486.

The product of its (nonzero) digits is 540, while the sum is 22.

The square root of 305149 is about 552.4029326497. The cubic root of 305149 is about 67.3241145653.

It can be divided in two parts, 305 and 149, that added together give a palindrome (454).

The spelling of 305149 in words is "three hundred five thousand, one hundred forty-nine".