3131212231 has 4 divisors (see below), whose sum is σ = 3578528272. Its totient is φ = 2683896192.

The previous prime is 3131212229. The next prime is 3131212277. The reversal of 3131212231 is 1322121313.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1322121313 = 2017 ⋅655489.

It is a cyclic number.

It is not a de Polignac number, because 3131212231 - 2¹ = 3131212229 is a prime.

It is a super-2 number, since 2×3131212231² = 19608980071127994722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 3131212199 and 3131212208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3131212211) 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, 223658010 + ... + 223658023.

It is an arithmetic number, because the mean of its divisors is an integer number (894632068).

Almost surely, 2^3131212231 is an apocalyptic number.

3131212231 is a deficient number, since it is larger than the sum of its proper divisors (447316041).

3131212231 is an equidigital number, since it uses as much as digits as its factorization.

3131212231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 447316040.

The product of its digits is 216, while the sum is 19.

The square root of 3131212231 is about 55957.2357340854. The cubic root of 3131212231 is about 1462.9770104563.

Adding to 3131212231 its reverse (1322121313), we get a palindrome (4453333544).

The spelling of 3131212231 in words is "three billion, one hundred thirty-one million, two hundred twelve thousand, two hundred thirty-one".