311221301322313 has 4 divisors (see below), whose sum is σ = 311229750882708. Its totient is φ = 311212851761920.

The previous prime is 311221301322307. The next prime is 311221301322353. The reversal of 311221301322313 is 313223103122113.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 47654128820809 + 263567172501504 = 6903197^2 + 16234752^2 .

It is a cyclic number.

It is not a de Polignac number, because 311221301322313 - 2²⁵ = 311221267767881 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (311221301322353) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4224724948 + ... + 4224798613.

It is an arithmetic number, because the mean of its divisors is an integer number (77807437720677).

Almost surely, 2^{311221301322313} is an apocalyptic number.

It is an amenable number.

311221301322313 is a deficient number, since it is larger than the sum of its proper divisors (8449560395).

311221301322313 is an equidigital number, since it uses as much as digits as its factorization.

311221301322313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8449560394.

The product of its (nonzero) digits is 3888, while the sum is 28.

Adding to 311221301322313 its reverse (313223103122113), we get a palindrome (624444404444426).

The spelling of 311221301322313 in words is "three hundred eleven trillion, two hundred twenty-one billion, three hundred one million, three hundred twenty-two thousand, three hundred thirteen".