311321330521 has 2 divisors, whose sum is σ = 311321330522. Its totient is φ = 311321330520.

The previous prime is 311321330513. The next prime is 311321330587. The reversal of 311321330521 is 125033123113.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 272103073225 + 39218257296 = 521635^2 + 198036^2 .

It is a cyclic number.

It is not a de Polignac number, because 311321330521 - 2³ = 311321330513 is a prime.

It is a super-2 number, since 2×311321330521² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (311321330501) 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, 155660665260 + 155660665261.

It is an arithmetic number, because the mean of its divisors is an integer number (155660665261).

Almost surely, 2^311321330521 is an apocalyptic number.

It is an amenable number.

311321330521 is a deficient number, since it is larger than the sum of its proper divisors (1).

311321330521 is an equidigital number, since it uses as much as digits as its factorization.

311321330521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1620, while the sum is 25.

Adding to 311321330521 its reverse (125033123113), we get a palindrome (436354453634).

The spelling of 311321330521 in words is "three hundred eleven billion, three hundred twenty-one million, three hundred thirty thousand, five hundred twenty-one".