128749876091197 has 2 divisors, whose sum is σ = 128749876091198. Its totient is φ = 128749876091196.

The previous prime is 128749876091159. The next prime is 128749876091209. The reversal of 128749876091197 is 791190678947821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 103282219281796 + 25467656809401 = 10162786^2 + 5046549^2 .

It is a cyclic number.

It is not a de Polignac number, because 128749876091197 - 2¹⁵ = 128749876058429 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128749876091147) 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, 64374938045598 + 64374938045599.

It is an arithmetic number, because the mean of its divisors is an integer number (64374938045599).

Almost surely, 2^{128749876091197} is an apocalyptic number.

It is an amenable number.

128749876091197 is a deficient number, since it is larger than the sum of its proper divisors (1).

128749876091197 is an equidigital number, since it uses as much as digits as its factorization.

128749876091197 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 768144384, while the sum is 79.

The spelling of 128749876091197 in words is "one hundred twenty-eight trillion, seven hundred forty-nine billion, eight hundred seventy-six million, ninety-one thousand, one hundred ninety-seven".