31031390140 has 48 divisors (see below), whose sum is σ = 70449674400. Its totient is φ = 11441440512.

The previous prime is 31031390111. The next prime is 31031390141. The reversal of 31031390140 is 4109313013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31031390141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1089475 + ... + 1117594.

It is an arithmetic number, because the mean of its divisors is an integer number (1467701550).

Almost surely, 2^31031390140 is an apocalyptic number.

It is an amenable number.

31031390140 is an abundant number, since it is smaller than the sum of its proper divisors (39418284260).

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

31031390140 is a wasteful number, since it uses less digits than its factorization.

31031390140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2207134 (or 2207132 counting only the distinct ones).

The product of its (nonzero) digits is 972, while the sum is 25.

The spelling of 31031390140 in words is "thirty-one billion, thirty-one million, three hundred ninety thousand, one hundred forty".