31043031040 has 208 divisors, whose sum is σ = 86245332480. Its totient is φ = 10504765440.

The previous prime is 31043031029. The next prime is 31043031091. The reversal of 31043031040 is 4013034013.

It is a junction number, because it is equal to n+sod(n) for n = 31043030999 and 31043031017.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11324070 + ... + 11326810.

Almost surely, 2^31043031040 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 31043031040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43122666240).

31043031040 is an abundant number, since it is smaller than the sum of its proper divisors (55202301440).

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

31043031040 is an equidigital number, since it uses as much as digits as its factorization.

31043031040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2856 (or 2834 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 19.

Adding to 31043031040 its reverse (4013034013), we get a palindrome (35056065053).

The spelling of 31043031040 in words is "thirty-one billion, forty-three million, thirty-one thousand, forty".