304312321 has 4 divisors (see below), whose sum is σ = 304706772. Its totient is φ = 303917872.

The previous prime is 304312313. The next prime is 304312331. The reversal of 304312321 is 123213403.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 123213403 = 349 ⋅353047.

It can be written as a sum of positive squares in 2 ways, for example, as 23280625 + 281031696 = 4825^2 + 16764^2 .

It is a cyclic number.

It is not a de Polignac number, because 304312321 - 2³ = 304312313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (304312331) 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, 196066 + ... + 197611.

It is an arithmetic number, because the mean of its divisors is an integer number (76176693).

Almost surely, 2^304312321 is an apocalyptic number.

It is an amenable number.

304312321 is a deficient number, since it is larger than the sum of its proper divisors (394451).

304312321 is an equidigital number, since it uses as much as digits as its factorization.

304312321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 394450.

The product of its (nonzero) digits is 432, while the sum is 19.

The square root of 304312321 is about 17444.5498938780. The cubic root of 304312321 is about 672.6252691099.

Adding to 304312321 its reverse (123213403), we get a palindrome (427525724).

The spelling of 304312321 in words is "three hundred four million, three hundred twelve thousand, three hundred twenty-one".