3121320313 has 4 divisors (see below), whose sum is σ = 3124549120. Its totient is φ = 3118091508.

The previous prime is 3121320287. The next prime is 3121320329. The reversal of 3121320313 is 3130231213.

3121320313 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 3130231213 = 359 ⋅8719307.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3121320313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3121320113) 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, 1612953 + ... + 1614886.

It is an arithmetic number, because the mean of its divisors is an integer number (781137280).

Almost surely, 2^3121320313 is an apocalyptic number.

It is an amenable number.

3121320313 is a deficient number, since it is larger than the sum of its proper divisors (3228807).

3121320313 is an equidigital number, since it uses as much as digits as its factorization.

3121320313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3228806.

The product of its (nonzero) digits is 324, while the sum is 19.

The square root of 3121320313 is about 55868.7776222104. Note that the first 3 decimals coincide. The cubic root of 3121320313 is about 1461.4348053243.

Adding to 3121320313 its reverse (3130231213), we get a palindrome (6251551526).

The spelling of 3121320313 in words is "three billion, one hundred twenty-one million, three hundred twenty thousand, three hundred thirteen".