313121232133 has 4 divisors (see below), whose sum is σ = 318254367148. Its totient is φ = 307988097120.

The previous prime is 313121232113. The next prime is 313121232157. The reversal of 313121232133 is 331232121313.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 331232121313 = 769 ⋅430730977.

It can be written as a sum of positive squares in 2 ways, for example, as 114773921089 + 198347311044 = 338783^2 + 445362^2 .

It is a cyclic number.

It is not a de Polignac number, because 313121232133 - 2¹³ = 313121223941 is a prime.

It is a super-3 number, since 3×313121232133³ (a number of 35 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 313121232098 and 313121232107.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (313121232113) 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, 2566567416 + ... + 2566567537.

It is an arithmetic number, because the mean of its divisors is an integer number (79563591787).

Almost surely, 2^313121232133 is an apocalyptic number.

It is an amenable number.

313121232133 is a deficient number, since it is larger than the sum of its proper divisors (5133135015).

313121232133 is an equidigital number, since it uses as much as digits as its factorization.

313121232133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5133135014.

The product of its digits is 1944, while the sum is 25.

Adding to 313121232133 its reverse (331232121313), we get a palindrome (644353353446).

The spelling of 313121232133 in words is "three hundred thirteen billion, one hundred twenty-one million, two hundred thirty-two thousand, one hundred thirty-three".