305320231 has 4 divisors (see below), whose sum is σ = 308998872. Its totient is φ = 301641592.

The previous prime is 305320229. The next prime is 305320277. The reversal of 305320231 is 132023503.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 132023503 = 131 ⋅1007813.

It is a cyclic number.

It is not a de Polignac number, because 305320231 - 2¹ = 305320229 is a prime.

It is a super-2 number, since 2×305320231² = 186440886915786722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 305320199 and 305320208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (305320201) 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, 1839196 + ... + 1839361.

It is an arithmetic number, because the mean of its divisors is an integer number (77249718).

Almost surely, 2^305320231 is an apocalyptic number.

305320231 is a deficient number, since it is larger than the sum of its proper divisors (3678641).

305320231 is an equidigital number, since it uses as much as digits as its factorization.

305320231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3678640.

The product of its (nonzero) digits is 540, while the sum is 19.

The square root of 305320231 is about 17473.4149781890. The cubic root of 305320231 is about 673.3670493906.

Adding to 305320231 its reverse (132023503), we get a palindrome (437343734).

The spelling of 305320231 in words is "three hundred five million, three hundred twenty thousand, two hundred thirty-one".