3031111220 has 48 divisors (see below), whose sum is σ = 6751155600. Its totient is φ = 1139195904.

The previous prime is 3031111219. The next prime is 3031111229. The reversal of 3031111220 is 221111303.

It can be written as a sum of positive squares in 8 ways, for example, as 32672656 + 2998438564 = 5716^2 + 54758^2 .

It is a junction number, because it is equal to n+sod(n) for n = 3031111195 and 3031111204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3031111229) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 202556 + ... + 217004.

It is an arithmetic number, because the mean of its divisors is an integer number (140649075).

Almost surely, 2^3031111220 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 3031111220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3375577800).

3031111220 is an abundant number, since it is smaller than the sum of its proper divisors (3720044380).

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

3031111220 is a wasteful number, since it uses less digits than its factorization.

3031111220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15092 (or 15090 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 14.

The square root of 3031111220 is about 55055.5285144008. The cubic root of 3031111220 is about 1447.2180063027.

Adding to 3031111220 its reverse (221111303), we get a palindrome (3252222523).

The spelling of 3031111220 in words is "three billion, thirty-one million, one hundred eleven thousand, two hundred twenty".