313331323121 has 4 divisors (see below), whose sum is σ = 319243234932. Its totient is φ = 307419411312.

The previous prime is 313331323061. The next prime is 313331323127. The reversal of 313331323121 is 121323133313.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 121323133313 = 107 ⋅1133861059.

It can be written as a sum of positive squares in 2 ways, for example, as 270426000625 + 42905322496 = 520025^2 + 207136^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-313331323121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (313331323127) 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, 2955955826 + ... + 2955955931.

It is an arithmetic number, because the mean of its divisors is an integer number (79810808733).

Almost surely, 2^313331323121 is an apocalyptic number.

It is an amenable number.

313331323121 is a deficient number, since it is larger than the sum of its proper divisors (5911911811).

313331323121 is an equidigital number, since it uses as much as digits as its factorization.

313331323121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5911911810.

The product of its digits is 2916, while the sum is 26.

Adding to 313331323121 its reverse (121323133313), we get a palindrome (434654456434).

The spelling of 313331323121 in words is "three hundred thirteen billion, three hundred thirty-one million, three hundred twenty-three thousand, one hundred twenty-one".