311230321 has 4 divisors (see below), whose sum is σ = 311314752. Its totient is φ = 311145892.

The previous prime is 311230289. The next prime is 311230331. The reversal of 311230321 is 123032113.

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: 123032113 = 1627 ⋅75619.

It is a cyclic number.

It is not a de Polignac number, because 311230321 - 2⁵ = 311230289 is a prime.

It is a super-3 number, since 3×311230321³ (a number of 26 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 311230295 and 311230304.

It is not an unprimeable number, because it can be changed into a prime (311230331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36421 + ... + 44146.

It is an arithmetic number, because the mean of its divisors is an integer number (77828688).

Almost surely, 2^311230321 is an apocalyptic number.

It is an amenable number.

311230321 is a deficient number, since it is larger than the sum of its proper divisors (84431).

311230321 is an equidigital number, since it uses as much as digits as its factorization.

311230321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84430.

The product of its (nonzero) digits is 108, while the sum is 16.

The square root of 311230321 is about 17641.7210328244. The cubic root of 311230321 is about 677.6841062273.

Adding to 311230321 its reverse (123032113), we get a palindrome (434262434).

It can be divided in two parts, 3112 and 30321, that added together give a palindrome (33433).

The spelling of 311230321 in words is "three hundred eleven million, two hundred thirty thousand, three hundred twenty-one".