3131212220 has 12 divisors (see below), whose sum is σ = 6575545704. Its totient is φ = 1252484880.

The previous prime is 3131212213. The next prime is 3131212229. The reversal of 3131212220 is 222121313.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3131212229) 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, 78280286 + ... + 78280325.

It is an arithmetic number, because the mean of its divisors is an integer number (547962142).

Almost surely, 2^3131212220 is an apocalyptic number.

It is an amenable number.

3131212220 is an abundant number, since it is smaller than the sum of its proper divisors (3444333484).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

3131212220 is a wasteful number, since it uses less digits than its factorization.

3131212220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 156560620 (or 156560618 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 3131212220 is about 55957.2356357960. The cubic root of 3131212220 is about 1462.9770087432.

Adding to 3131212220 its reverse (222121313), we get a palindrome (3353333533).

The spelling of 3131212220 in words is "three billion, one hundred thirty-one million, two hundred twelve thousand, two hundred twenty".