311306321 has 4 divisors (see below), whose sum is σ = 315952752. Its totient is φ = 306659892.

The previous prime is 311306297. The next prime is 311306327. The reversal of 311306321 is 123603113.

It is a happy number.

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.

It is a cyclic number.

It is not a de Polignac number, because 311306321 - 2⁶ = 311306257 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 311306293 and 311306302.

It is not an unprimeable number, because it can be changed into a prime (311306327) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2323115 + ... + 2323248.

It is an arithmetic number, because the mean of its divisors is an integer number (78988188).

Almost surely, 2^311306321 is an apocalyptic number.

It is an amenable number.

311306321 is a deficient number, since it is larger than the sum of its proper divisors (4646431).

311306321 is an equidigital number, since it uses as much as digits as its factorization.

311306321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4646430.

The product of its (nonzero) digits is 324, while the sum is 20.

The square root of 311306321 is about 17643.8748862034. The cubic root of 311306321 is about 677.7392634500.

Adding to 311306321 its reverse (123603113), we get a palindrome (434909434).

The spelling of 311306321 in words is "three hundred eleven million, three hundred six thousand, three hundred twenty-one".