313122123121 has 4 divisors (see below), whose sum is σ = 313442617572. Its totient is φ = 312801628672.

The previous prime is 313122123113. The next prime is 313122123133. The reversal of 313122123121 is 121321221313.

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 204462230625 + 108659892496 = 452175^2 + 329636^2 .

It is a cyclic number.

It is not a de Polignac number, because 313122123121 - 2³ = 313122123113 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 313122123092 and 313122123101.

It is not an unprimeable number, because it can be changed into a prime (313122124121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 160245760 + ... + 160247713.

It is an arithmetic number, because the mean of its divisors is an integer number (78360654393).

Almost surely, 2^313122123121 is an apocalyptic number.

It is an amenable number.

313122123121 is a deficient number, since it is larger than the sum of its proper divisors (320494451).

313122123121 is an equidigital number, since it uses as much as digits as its factorization.

313122123121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 320494450.

The product of its digits is 432, while the sum is 22.

Adding to 313122123121 its reverse (121321221313), we get a palindrome (434443344434).

The spelling of 313122123121 in words is "three hundred thirteen billion, one hundred twenty-two million, one hundred twenty-three thousand, one hundred twenty-one".