3131146220 has 48 divisors (see below), whose sum is σ = 6745437216. Its totient is φ = 1220160000.

The previous prime is 3131146181. The next prime is 3131146231. The reversal of 3131146220 is 226411313.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 670895 + ... + 675545.

It is an arithmetic number, because the mean of its divisors is an integer number (140529942).

Almost surely, 2^3131146220 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 3131146220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3372718608).

3131146220 is an abundant number, since it is smaller than the sum of its proper divisors (3614290996).

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

3131146220 is a wasteful number, since it uses less digits than its factorization.

3131146220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5522 (or 5520 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 3131146220 is about 55956.6458966225. The cubic root of 3131146220 is about 1462.9667297464.

Adding to 3131146220 its reverse (226411313), we get a palindrome (3357557533).

The spelling of 3131146220 in words is "three billion, one hundred thirty-one million, one hundred forty-six thousand, two hundred twenty".