305317 has 4 divisors (see below), whose sum is σ = 306976. Its totient is φ = 303660.

The previous prime is 305297. The next prime is 305329. The reversal of 305317 is 713503.

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: 713503 = 7 ⋅101929.

It is a cyclic number.

It is not a de Polignac number, because 305317 - 2¹⁵ = 272549 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 305294 and 305303.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (305377) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 513 + ... + 934.

It is an arithmetic number, because the mean of its divisors is an integer number (76744).

2³⁰⁵³¹⁷ is an apocalyptic number.

It is an amenable number.

305317 is a deficient number, since it is larger than the sum of its proper divisors (1659).

305317 is a wasteful number, since it uses less digits than its factorization.

305317 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1658.

The product of its (nonzero) digits is 315, while the sum is 19.

The square root of 305317 is about 552.5549746405. The cubic root of 305317 is about 67.3364674118.

The spelling of 305317 in words is "three hundred five thousand, three hundred seventeen".