313321323181 has 2 divisors, whose sum is σ = 313321323182. Its totient is φ = 313321323180.

The previous prime is 313321323179. The next prime is 313321323209. The reversal of 313321323181 is 181323123313.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 168400253956 + 144921069225 = 410366^2 + 380685^2 .

It is an emirp because it is prime and its reverse (181323123313) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 313321323181 - 2¹ = 313321323179 is a prime.

It is a super-2 number, since 2×313321323181² (a number of 24 digits) contains 22 as substring.

Together with 313321323179, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (313321323121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 156660661590 + 156660661591.

It is an arithmetic number, because the mean of its divisors is an integer number (156660661591).

Almost surely, 2^313321323181 is an apocalyptic number.

It is an amenable number.

313321323181 is a deficient number, since it is larger than the sum of its proper divisors (1).

313321323181 is an equidigital number, since it uses as much as digits as its factorization.

313321323181 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7776, while the sum is 31.

Adding to 313321323181 its reverse (181323123313), we get a palindrome (494644446494).

The spelling of 313321323181 in words is "three hundred thirteen billion, three hundred twenty-one million, three hundred twenty-three thousand, one hundred eighty-one".