1971286364161 has 2 divisors, whose sum is σ = 1971286364162. Its totient is φ = 1971286364160.

The previous prime is 1971286364141. The next prime is 1971286364167. The reversal of 1971286364161 is 1614636821791.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1268707124161 + 702579240000 = 1126369^2 + 838200^2 .

It is a cyclic number.

It is not a de Polignac number, because 1971286364161 - 2¹⁵ = 1971286331393 is a prime.

It is not a weakly prime, because it can be changed into another prime (1971286364167) 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, 985643182080 + 985643182081.

It is an arithmetic number, because the mean of its divisors is an integer number (985643182081).

Almost surely, 2^{1971286364161} is an apocalyptic number.

It is an amenable number.

1971286364161 is a deficient number, since it is larger than the sum of its proper divisors (1).

1971286364161 is an equidigital number, since it uses as much as digits as its factorization.

1971286364161 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2612736, while the sum is 55.

The spelling of 1971286364161 in words is "one trillion, nine hundred seventy-one billion, two hundred eighty-six million, three hundred sixty-four thousand, one hundred sixty-one".