31031423252440 has 128 divisors (see below), whose sum is σ = 79177403289600. Its totient is φ = 10850817646080.

The previous prime is 31031423252399. The next prime is 31031423252491. The reversal of 31031423252440 is 4425232413013.

It is a junction number, because it is equal to n+sod(n) for n = 31031423252396 and 31031423252405.

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, 27012409 + ... + 28137751.

It is an arithmetic number, because the mean of its divisors is an integer number (618573463200).

Almost surely, 2^{31031423252440} 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 31031423252440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39588701644800).

31031423252440 is an abundant number, since it is smaller than the sum of its proper divisors (48145980037160).

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

31031423252440 is a wasteful number, since it uses less digits than its factorization.

31031423252440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1128177 (or 1128173 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 34.

Adding to 31031423252440 its reverse (4425232413013), we get a palindrome (35456655665453).

The spelling of 31031423252440 in words is "thirty-one trillion, thirty-one billion, four hundred twenty-three million, two hundred fifty-two thousand, four hundred forty".