31431251163140 has 12 divisors (see below), whose sum is σ = 66005627442636. Its totient is φ = 12572500465248.

The previous prime is 31431251163139. The next prime is 31431251163173. The reversal of 31431251163140 is 4136115213413.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 19863797161924 + 11567454001216 = 4456882^2 + 3401096^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 31431251163140.

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 3 ways as a sum of consecutive naturals, for example, 785781279059 + ... + 785781279098.

It is an arithmetic number, because the mean of its divisors is an integer number (5500468953553).

Almost surely, 2^{31431251163140} is an apocalyptic number.

It is an amenable number.

31431251163140 is an abundant number, since it is smaller than the sum of its proper divisors (34574376279496).

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

31431251163140 is a wasteful number, since it uses less digits than its factorization.

31431251163140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1571562558166 (or 1571562558164 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 35.

Adding to 31431251163140 its reverse (4136115213413), we get a palindrome (35567366376553).

The spelling of 31431251163140 in words is "thirty-one trillion, four hundred thirty-one billion, two hundred fifty-one million, one hundred sixty-three thousand, one hundred forty".