3131115321 has 4 divisors (see below), whose sum is σ = 4174820432. Its totient is φ = 2087410212.

The previous prime is 3131115307. The next prime is 3131115329. The reversal of 3131115321 is 1235111313.

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.

It is not a de Polignac number, because 3131115321 - 2⁹ = 3131114809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3131115329) 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, 521852551 + ... + 521852556.

It is an arithmetic number, because the mean of its divisors is an integer number (1043705108).

Almost surely, 2^3131115321 is an apocalyptic number.

It is an amenable number.

3131115321 is a deficient number, since it is larger than the sum of its proper divisors (1043705111).

3131115321 is a wasteful number, since it uses less digits than its factorization.

3131115321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1043705110.

The product of its digits is 270, while the sum is 21.

The square root of 3131115321 is about 55956.3697982634. The cubic root of 3131115321 is about 1462.9619174131.

Adding to 3131115321 its reverse (1235111313), we get a palindrome (4366226634).

The spelling of 3131115321 in words is "three billion, one hundred thirty-one million, one hundred fifteen thousand, three hundred twenty-one".