3131431220 has 24 divisors (see below), whose sum is σ = 6579334944. Its totient is φ = 1251938336.

The previous prime is 3131431217. The next prime is 3131431267. The reversal of 3131431220 is 221341313.

It is a super-2 number, since 2×3131431220² = 19611722971181376800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 3131431192 and 3131431201.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 1919 + ... + 79161.

It is an arithmetic number, because the mean of its divisors is an integer number (274138956).

Almost surely, 2^3131431220 is an apocalyptic number.

It is an amenable number.

3131431220 is an abundant number, since it is smaller than the sum of its proper divisors (3447903724).

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

3131431220 is a wasteful number, since it uses less digits than its factorization.

3131431220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79279 (or 79277 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 3131431220 is about 55959.1924530724. The cubic root of 3131431220 is about 1463.0111152886.

Adding to 3131431220 its reverse (221341313), we get a palindrome (3352772533).

The spelling of 3131431220 in words is "three billion, one hundred thirty-one million, four hundred thirty-one thousand, two hundred twenty".