3131223220 has 96 divisors (see below), whose sum is σ = 7046403840. Its totient is φ = 1166161920.

The previous prime is 3131223211. The next prime is 3131223239. The reversal of 3131223220 is 223221313.

3131223220 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3066310 + ... + 3067330.

It is an arithmetic number, because the mean of its divisors is an integer number (73400040).

Almost surely, 2^3131223220 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3131223220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3523201920).

3131223220 is an abundant number, since it is smaller than the sum of its proper divisors (3915180620).

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

3131223220 is a wasteful number, since it uses less digits than its factorization.

3131223220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1225 (or 1223 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 19.

The square root of 3131223220 is about 55957.3339250540. Note that the first 3 decimals coincide. The cubic root of 3131223220 is about 1462.9787218953.

Adding to 3131223220 its reverse (223221313), we get a palindrome (3354444533).

The spelling of 3131223220 in words is "three billion, one hundred thirty-one million, two hundred twenty-three thousand, two hundred twenty".