31031431140 has 96 divisors (see below), whose sum is σ = 88428332160. Its totient is φ = 8128567296.

The previous prime is 31031431103. The next prime is 31031431141. The reversal of 31031431140 is 4113413013.

It is not an unprimeable number, because it can be changed into a prime (31031431141) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6288114 + ... + 6293046.

It is an arithmetic number, because the mean of its divisors is an integer number (921128460).

Almost surely, 2^31031431140 is an apocalyptic number.

31031431140 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31031431140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44214166080).

31031431140 is an abundant number, since it is smaller than the sum of its proper divisors (57396901020).

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

31031431140 is a wasteful number, since it uses less digits than its factorization.

31031431140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6781 (or 6779 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 21.

Adding to 31031431140 its reverse (4113413013), we get a palindrome (35144844153).

The spelling of 31031431140 in words is "thirty-one billion, thirty-one million, four hundred thirty-one thousand, one hundred forty".