43131031040 has 80 divisors (see below), whose sum is σ = 103467676752. Its totient is φ = 17243357184.

The previous prime is 43131031003. The next prime is 43131031061. The reversal of 43131031040 is 4013013134.

It is a tau number, because it is divible by the number of its divisors (80).

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7106087 + ... + 7112153.

Almost surely, 2^43131031040 is an apocalyptic number.

43131031040 is a gapful number since it is divisible by the number (40) 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 43131031040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (51733838376).

43131031040 is an abundant number, since it is smaller than the sum of its proper divisors (60336645712).

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

43131031040 is an equidigital number, since it uses as much as digits as its factorization.

43131031040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8867 (or 8851 counting only the distinct ones).

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

Adding to 43131031040 its reverse (4013013134), we get a palindrome (47144044174).

The spelling of 43131031040 in words is "forty-three billion, one hundred thirty-one million, thirty-one thousand, forty".