313113312121 has 4 divisors (see below), whose sum is σ = 313952758372. Its totient is φ = 312273865872.

The previous prime is 313113312077. The next prime is 313113312143. The reversal of 313113312121 is 121213311313.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 121213311313 = 89753 ⋅1350521.

It can be written as a sum of positive squares in 2 ways, for example, as 91400405625 + 221712906496 = 302325^2 + 470864^2 .

It is a cyclic number.

It is not a de Polignac number, because 313113312121 - 2¹⁷ = 313113181049 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 313113312092 and 313113312101.

It is not an unprimeable number, because it can be changed into a prime (313113312181) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 419722566 + ... + 419723311.

It is an arithmetic number, because the mean of its divisors is an integer number (78488189593).

Almost surely, 2^313113312121 is an apocalyptic number.

It is an amenable number.

313113312121 is a deficient number, since it is larger than the sum of its proper divisors (839446251).

313113312121 is an equidigital number, since it uses as much as digits as its factorization.

313113312121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 839446250.

The product of its digits is 324, while the sum is 22.

Adding to 313113312121 its reverse (121213311313), we get a palindrome (434326623434).

The spelling of 313113312121 in words is "three hundred thirteen billion, one hundred thirteen million, three hundred twelve thousand, one hundred twenty-one".