31601813073813 has 24 divisors (see below), whose sum is σ = 46916913926168. Its totient is φ = 20482668536832.

The previous prime is 31601813073811. The next prime is 31601813073851. The reversal of 31601813073813 is 31837031810613.

31601813073813 is a `hidden beast` number, since 3 + 1 + 60 + 181 + 30 + 7 + 381 + 3 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 16418687792004 + 15183125281809 = 4051998^2 + 3896553^2 .

It is not a de Polignac number, because 31601813073813 - 2¹ = 31601813073811 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31601813073811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 36152656 + ... + 37016457.

Almost surely, 2^{31601813073813} is an apocalyptic number.

It is an amenable number.

31601813073813 is a deficient number, since it is larger than the sum of its proper divisors (15315100852355).

31601813073813 is a wasteful number, since it uses less digits than its factorization.

31601813073813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73170453 (or 73170450 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 45.

The spelling of 31601813073813 in words is "thirty-one trillion, six hundred one billion, eight hundred thirteen million, seventy-three thousand, eight hundred thirteen".