31431312140 has 24 divisors (see below), whose sum is σ = 66011772960. Its totient is φ = 12571378688.

The previous prime is 31431312139. The next prime is 31431312173. The reversal of 31431312140 is 4121313413.

It is a super-2 number, since 2×31431312140² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 173729 + ... + 305031.

It is an arithmetic number, because the mean of its divisors is an integer number (2750490540).

Almost surely, 2^31431312140 is an apocalyptic number.

It is an amenable number.

31431312140 is an abundant number, since it is smaller than the sum of its proper divisors (34580460820).

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

31431312140 is a wasteful number, since it uses less digits than its factorization.

31431312140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143281 (or 143279 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 23.

Adding to 31431312140 its reverse (4121313413), we get a palindrome (35552625553).

The spelling of 31431312140 in words is "thirty-one billion, four hundred thirty-one million, three hundred twelve thousand, one hundred forty".