31631506140340 has 12 divisors (see below), whose sum is σ = 66426162894756. Its totient is φ = 12652602456128.

The previous prime is 31631506140307. The next prime is 31631506140383. The reversal of 31631506140340 is 4304160513613.

It can be written as a sum of positive squares in 2 ways, for example, as 18647576704656 + 12983929435684 = 4318284^2 + 3603322^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 31631506140340.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 790787653489 + ... + 790787653528.

It is an arithmetic number, because the mean of its divisors is an integer number (5535513574563).

Almost surely, 2^{31631506140340} is an apocalyptic number.

It is an amenable number.

31631506140340 is an abundant number, since it is smaller than the sum of its proper divisors (34794656754416).

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

31631506140340 is a wasteful number, since it uses less digits than its factorization.

31631506140340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1581575307026 (or 1581575307024 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 37.

Adding to 31631506140340 its reverse (4304160513613), we get a palindrome (35935666653953).

The spelling of 31631506140340 in words is "thirty-one trillion, six hundred thirty-one billion, five hundred six million, one hundred forty thousand, three hundred forty".