1971936342197 has 4 divisors (see below), whose sum is σ = 1971942986220. Its totient is φ = 1971929698176.

The previous prime is 1971936342161. The next prime is 1971936342199. The reversal of 1971936342197 is 7912436391791.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 333559382116 + 1638376960081 = 577546^2 + 1279991^2 .

It is a cyclic number.

It is not a de Polignac number, because 1971936342197 - 2¹⁸ = 1971936080053 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1971936342199) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2854922 + ... + 3477707.

It is an arithmetic number, because the mean of its divisors is an integer number (492985746555).

Almost surely, 2^{1971936342197} is an apocalyptic number.

It is an amenable number.

1971936342197 is a deficient number, since it is larger than the sum of its proper divisors (6644023).

1971936342197 is an equidigital number, since it uses as much as digits as its factorization.

1971936342197 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6644022.

The product of its digits is 15431472, while the sum is 62.

The spelling of 1971936342197 in words is "one trillion, nine hundred seventy-one billion, nine hundred thirty-six million, three hundred forty-two thousand, one hundred ninety-seven".