4131131220 has 72 divisors (see below), whose sum is σ = 12995228064. Its totient is φ = 1101633696.

The previous prime is 4131131219. The next prime is 4131131227. The reversal of 4131131220 is 221311314.

4131131220 is a `hidden beast` number, since 41 + 311 + 312 + 2 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 4131131193 and 4131131202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4131131227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 420154 + ... + 429873.

Almost surely, 2^4131131220 is an apocalyptic number.

It is an amenable number.

4131131220 is an abundant number, since it is smaller than the sum of its proper divisors (8864096844).

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

4131131220 is a wasteful number, since it uses less digits than its factorization.

4131131220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 850051 (or 850037 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 4131131220 is about 64273.8766529606. The cubic root of 4131131220 is about 1604.5613614853.

Adding to 4131131220 its reverse (221311314), we get a palindrome (4352442534).

The spelling of 4131131220 in words is "four billion, one hundred thirty-one million, one hundred thirty-one thousand, two hundred twenty".