311305240621 has 2 divisors, whose sum is σ = 311305240622. Its totient is φ = 311305240620.

The previous prime is 311305240619. The next prime is 311305240679. The reversal of 311305240621 is 126042503113.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 266138364996 + 45166875625 = 515886^2 + 212525^2 .

It is a cyclic number.

It is not a de Polignac number, because 311305240621 - 2¹ = 311305240619 is a prime.

Together with 311305240619, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 311305240621.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (311305240681) 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 as a sum of consecutive naturals, namely, 155652620310 + 155652620311.

It is an arithmetic number, because the mean of its divisors is an integer number (155652620311).

Almost surely, 2^311305240621 is an apocalyptic number.

It is an amenable number.

311305240621 is a deficient number, since it is larger than the sum of its proper divisors (1).

311305240621 is an equidigital number, since it uses as much as digits as its factorization.

311305240621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4320, while the sum is 28.

Adding to 311305240621 its reverse (126042503113), we get a palindrome (437347743734).

The spelling of 311305240621 in words is "three hundred eleven billion, three hundred five million, two hundred forty thousand, six hundred twenty-one".