3131343543420 has 144 divisors (see below), whose sum is σ = 9755039679840. Its totient is φ = 812744256000.

The previous prime is 3131343543359. The next prime is 3131343543421. The reversal of 3131343543420 is 243453431313.

3131343543420 is a `hidden beast` number, since 3 + 1 + 31 + 3 + 43 + 543 + 42 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3131343543421) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 387051 + ... + 2532290.

It is an arithmetic number, because the mean of its divisors is an integer number (67743331110).

Almost surely, 2^{3131343543420} is an apocalyptic number.

3131343543420 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3131343543420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4877519839920).

3131343543420 is an abundant number, since it is smaller than the sum of its proper divisors (6623696136420).

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

3131343543420 is a wasteful number, since it uses less digits than its factorization.

3131343543420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2919516 (or 2919511 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 36.

Adding to 3131343543420 its reverse (243453431313), we get a palindrome (3374796974733).

It can be divided in two parts, 3131343 and 543420, that added together give a palindrome (3674763).

The spelling of 3131343543420 in words is "three trillion, one hundred thirty-one billion, three hundred forty-three million, five hundred forty-three thousand, four hundred twenty".