311420321 has 2 divisors, whose sum is σ = 311420322. Its totient is φ = 311420320.

The previous prime is 311420287. The next prime is 311420323. The reversal of 311420321 is 123024113.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 310288225 + 1132096 = 17615^2 + 1064^2 .

It is an emirp because it is prime and its reverse (123024113) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-311420321 is a prime.

Together with 311420323, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 311420321.

It is not a weakly prime, because it can be changed into another prime (311420323) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 155710160 + 155710161.

It is an arithmetic number, because the mean of its divisors is an integer number (155710161).

Almost surely, 2^311420321 is an apocalyptic number.

It is an amenable number.

311420321 is a deficient number, since it is larger than the sum of its proper divisors (1).

311420321 is an equidigital number, since it uses as much as digits as its factorization.

311420321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 311420321 is about 17647.1051733705. The cubic root of 311420321 is about 677.8219824544.

Adding to 311420321 its reverse (123024113), we get a palindrome (434444434).

The spelling of 311420321 in words is "three hundred eleven million, four hundred twenty thousand, three hundred twenty-one".