131021689351697 has 2 divisors, whose sum is σ = 131021689351698. Its totient is φ = 131021689351696.

The previous prime is 131021689351639. The next prime is 131021689351723. The reversal of 131021689351697 is 796153986120131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 127643018922241 + 3378670429456 = 11297921^2 + 1838116^2 .

It is a cyclic number.

It is not a de Polignac number, because 131021689351697 - 2¹⁶ = 131021689286161 is a prime.

It is not a weakly prime, because it can be changed into another prime (131021689359697) 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, 65510844675848 + 65510844675849.

It is an arithmetic number, because the mean of its divisors is an integer number (65510844675849).

Almost surely, 2^{131021689351697} is an apocalyptic number.

It is an amenable number.

131021689351697 is a deficient number, since it is larger than the sum of its proper divisors (1).

131021689351697 is an equidigital number, since it uses as much as digits as its factorization.

131021689351697 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14696640, while the sum is 62.

The spelling of 131021689351697 in words is "one hundred thirty-one trillion, twenty-one billion, six hundred eighty-nine million, three hundred fifty-one thousand, six hundred ninety-seven".