2131297818697 has 2 divisors, whose sum is σ = 2131297818698. Its totient is φ = 2131297818696.

The previous prime is 2131297818677. The next prime is 2131297818761. The reversal of 2131297818697 is 7968187921312.

It is an a-pointer prime, because the next prime (2131297818761) can be obtained adding 2131297818697 to its sum of digits (64).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1601366233401 + 529931585296 = 1265451^2 + 727964^2 .

It is a cyclic number.

It is not a de Polignac number, because 2131297818697 - 2²³ = 2131289430089 is a prime.

It is not a weakly prime, because it can be changed into another prime (2131297818667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1065648909348 + 1065648909349.

It is an arithmetic number, because the mean of its divisors is an integer number (1065648909349).

Almost surely, 2^{2131297818697} is an apocalyptic number.

It is an amenable number.

2131297818697 is a deficient number, since it is larger than the sum of its proper divisors (1).

2131297818697 is an equidigital number, since it uses as much as digits as its factorization.

2131297818697 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18289152, while the sum is 64.

The spelling of 2131297818697 in words is "two trillion, one hundred thirty-one billion, two hundred ninety-seven million, eight hundred eighteen thousand, six hundred ninety-seven".