31140412520 has 256 divisors, whose sum is σ = 86813337600. Its totient is φ = 9815178240.

The previous prime is 31140412481. The next prime is 31140412529. The reversal of 31140412520 is 2521404113.

It is not an unprimeable number, because it can be changed into a prime (31140412529) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 45065375 + ... + 45066065.

It is an arithmetic number, because the mean of its divisors is an integer number (339114600).

Almost surely, 2^31140412520 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 31140412520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43406668800).

31140412520 is an abundant number, since it is smaller than the sum of its proper divisors (55672925080).

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

31140412520 is a wasteful number, since it uses less digits than its factorization.

31140412520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 968 (or 964 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 23.

Adding to 31140412520 its reverse (2521404113), we get a palindrome (33661816633).

The spelling of 31140412520 in words is "thirty-one billion, one hundred forty million, four hundred twelve thousand, five hundred twenty".