3171307721689 has 2 divisors, whose sum is σ = 3171307721690. Its totient is φ = 3171307721688.

The previous prime is 3171307721671. The next prime is 3171307721767. The reversal of 3171307721689 is 9861277031713.

3171307721689 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2704436163289 + 466871558400 = 1644517^2 + 683280^2 .

It is a cyclic number.

It is not a de Polignac number, because 3171307721689 - 2⁵ = 3171307721657 is a prime.

It is not a weakly prime, because it can be changed into another prime (3171307721789) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1585653860844 + 1585653860845.

It is an arithmetic number, because the mean of its divisors is an integer number (1585653860845).

Almost surely, 2^{3171307721689} is an apocalyptic number.

It is an amenable number.

3171307721689 is a deficient number, since it is larger than the sum of its proper divisors (1).

3171307721689 is an equidigital number, since it uses as much as digits as its factorization.

3171307721689 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2667168, while the sum is 55.

The spelling of 3171307721689 in words is "three trillion, one hundred seventy-one billion, three hundred seven million, seven hundred twenty-one thousand, six hundred eighty-nine".