31971585673 has 2 divisors, whose sum is σ = 31971585674. Its totient is φ = 31971585672.

The previous prime is 31971585631. The next prime is 31971585677. The reversal of 31971585673 is 37658517913.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 31489212304 + 482373369 = 177452^2 + 21963^2 .

It is a cyclic number.

It is not a de Polignac number, because 31971585673 - 2¹⁷ = 31971454601 is a prime.

It is not a weakly prime, because it can be changed into another prime (31971585677) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15985792836 + 15985792837.

It is an arithmetic number, because the mean of its divisors is an integer number (15985792837).

Almost surely, 2^31971585673 is an apocalyptic number.

It is an amenable number.

31971585673 is a deficient number, since it is larger than the sum of its proper divisors (1).

31971585673 is an equidigital number, since it uses as much as digits as its factorization.

31971585673 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4762800, while the sum is 55.

The spelling of 31971585673 in words is "thirty-one billion, nine hundred seventy-one million, five hundred eighty-five thousand, six hundred seventy-three".