31597973173 has 8 divisors (see below), whose sum is σ = 34033062168. Its totient is φ = 29163523584.

The previous prime is 31597973171. The next prime is 31597973179. The reversal of 31597973173 is 37137979513.

It can be written as a sum of positive squares in 4 ways, for example, as 1619821009 + 29978152164 = 40247^2 + 173142^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 31597973173 - 2¹ = 31597973171 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 (31597973171) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 54640 + ... + 257257.

It is an arithmetic number, because the mean of its divisors is an integer number (4254132771).

Almost surely, 2^31597973173 is an apocalyptic number.

It is an amenable number.

31597973173 is a deficient number, since it is larger than the sum of its proper divisors (2435088995).

31597973173 is a wasteful number, since it uses less digits than its factorization.

31597973173 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 319703.

The product of its digits is 3750705, while the sum is 55.

The spelling of 31597973173 in words is "thirty-one billion, five hundred ninety-seven million, nine hundred seventy-three thousand, one hundred seventy-three".