31000131340 has 72 divisors (see below), whose sum is σ = 68773395600. Its totient is φ = 11736061056.

The previous prime is 31000131313. The next prime is 31000131353. The reversal of 31000131340 is 4313100013.

It is a super-2 number, since 2×31000131340² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 14070679 + ... + 14072881.

It is an arithmetic number, because the mean of its divisors is an integer number (955186050).

Almost surely, 2^31000131340 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 31000131340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34386697800).

31000131340 is an abundant number, since it is smaller than the sum of its proper divisors (37773264260).

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

31000131340 is a wasteful number, since it uses less digits than its factorization.

31000131340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4199 (or 4178 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 16.

Adding to 31000131340 its reverse (4313100013), we get a palindrome (35313231353).

The spelling of 31000131340 in words is "thirty-one billion, one hundred thirty-one thousand, three hundred forty".