31331223040 has 320 divisors, whose sum is σ = 86866940160. Its totient is φ = 10734796800.

The previous prime is 31331223019. The next prime is 31331223067. The reversal of 31331223040 is 4032213313.

It is a tau number, because it is divible by the number of its divisors (320).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 44694690 + ... + 44695390.

It is an arithmetic number, because the mean of its divisors is an integer number (271459188).

Almost surely, 2^31331223040 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 31331223040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43433470080).

31331223040 is an abundant number, since it is smaller than the sum of its proper divisors (55535717120).

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

31331223040 is a wasteful number, since it uses less digits than its factorization.

31331223040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 833 (or 817 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 22.

Adding to 31331223040 its reverse (4032213313), we get a palindrome (35363436353).

The spelling of 31331223040 in words is "thirty-one billion, three hundred thirty-one million, two hundred twenty-three thousand, forty".