1971176688161 has 2 divisors, whose sum is σ = 1971176688162. Its totient is φ = 1971176688160.

The previous prime is 1971176688137. The next prime is 1971176688223. The reversal of 1971176688161 is 1618866711791.

It is an a-pointer prime, because the next prime (1971176688223) can be obtained adding 1971176688161 to its sum of digits (62).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1656266041600 + 314910646561 = 1286960^2 + 561169^2 .

It is a cyclic number.

It is not a de Polignac number, because 1971176688161 - 2³⁰ = 1970102946337 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1971176688094 and 1971176688103.

It is not a weakly prime, because it can be changed into another prime (1971176684161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 985588344080 + 985588344081.

It is an arithmetic number, because the mean of its divisors is an integer number (985588344081).

Almost surely, 2^{1971176688161} is an apocalyptic number.

It is an amenable number.

1971176688161 is a deficient number, since it is larger than the sum of its proper divisors (1).

1971176688161 is an equidigital number, since it uses as much as digits as its factorization.

1971176688161 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6096384, while the sum is 62.

The spelling of 1971176688161 in words is "one trillion, nine hundred seventy-one billion, one hundred seventy-six million, six hundred eighty-eight thousand, one hundred sixty-one".