3131231213 has 16 divisors (see below), whose sum is σ = 3502215360. Its totient is φ = 2774755200.

The previous prime is 3131231161. The next prime is 3131231221. The reversal of 3131231213 is 3121321313.

It is a cyclic number.

It is not a de Polignac number, because 3131231213 - 2¹⁶ = 3131165677 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3131231263) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 709931 + ... + 714327.

It is an arithmetic number, because the mean of its divisors is an integer number (218888460).

Almost surely, 2^3131231213 is an apocalyptic number.

It is an amenable number.

3131231213 is a deficient number, since it is larger than the sum of its proper divisors (370984147).

3131231213 is a wasteful number, since it uses less digits than its factorization.

3131231213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6028.

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

The square root of 3131231213 is about 55957.4053454947. The cubic root of 3131231213 is about 1462.9799667314.

Adding to 3131231213 its reverse (3121321313), we get a palindrome (6252552526).

The spelling of 3131231213 in words is "three billion, one hundred thirty-one million, two hundred thirty-one thousand, two hundred thirteen".