31431135402140 has 24 divisors (see below), whose sum is σ = 66005750875680. Its totient is φ = 12572384345408.

The previous prime is 31431135402131. The next prime is 31431135402193. The reversal of 31431135402140 is 4120453113413.

It is a junction number, because it is equal to n+sod(n) for n = 31431135402097 and 31431135402106.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 592307 + ... + 7950666.

It is an arithmetic number, because the mean of its divisors is an integer number (2750239619820).

Almost surely, 2^{31431135402140} is an apocalyptic number.

It is an amenable number.

31431135402140 is an abundant number, since it is smaller than the sum of its proper divisors (34574615473540).

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

31431135402140 is a wasteful number, since it uses less digits than its factorization.

31431135402140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8726941 (or 8726939 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 32.

Adding to 31431135402140 its reverse (4120453113413), we get a palindrome (35551588515553).

The spelling of 31431135402140 in words is "thirty-one trillion, four hundred thirty-one billion, one hundred thirty-five million, four hundred two thousand, one hundred forty".