1731980232161 has 2 divisors, whose sum is σ = 1731980232162. Its totient is φ = 1731980232160.

The previous prime is 1731980232131. The next prime is 1731980232197. The reversal of 1731980232161 is 1612320891371.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 960997893025 + 770982339136 = 980305^2 + 878056^2 .

It is an emirp because it is prime and its reverse (1612320891371) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1731980232161 - 2³⁰ = 1730906490337 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1731980232131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 865990116080 + 865990116081.

It is an arithmetic number, because the mean of its divisors is an integer number (865990116081).

Almost surely, 2^{1731980232161} is an apocalyptic number.

It is an amenable number.

1731980232161 is a deficient number, since it is larger than the sum of its proper divisors (1).

1731980232161 is an equidigital number, since it uses as much as digits as its factorization.

1731980232161 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108864, while the sum is 44.

The spelling of 1731980232161 in words is "one trillion, seven hundred thirty-one billion, nine hundred eighty million, two hundred thirty-two thousand, one hundred sixty-one".