3121231313 has 4 divisors (see below), whose sum is σ = 3197358948. Its totient is φ = 3045103680.

The previous prime is 3121231273. The next prime is 3121231357. The reversal of 3121231313 is 3131321213.

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 1835865409 + 1285365904 = 42847^2 + 35852^2 .

It is a cyclic number.

It is not a de Polignac number, because 3121231313 - 2²⁴ = 3104454097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3121231013) 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, 38063756 + ... + 38063837.

It is an arithmetic number, because the mean of its divisors is an integer number (799339737).

Almost surely, 2^3121231313 is an apocalyptic number.

It is an amenable number.

3121231313 is a deficient number, since it is larger than the sum of its proper divisors (76127635).

3121231313 is an equidigital number, since it uses as much as digits as its factorization.

3121231313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76127634.

The product of its digits is 324, while the sum is 20.

The square root of 3121231313 is about 55867.9811072496. The cubic root of 3121231313 is about 1461.4209149488.

Adding to 3121231313 its reverse (3131321213), we get a palindrome (6252552526).

The spelling of 3121231313 in words is "three billion, one hundred twenty-one million, two hundred thirty-one thousand, three hundred thirteen".