128819161 has 2 divisors, whose sum is σ = 128819162. Its totient is φ = 128819160.

The previous prime is 128819153. The next prime is 128819177. The reversal of 128819161 is 161918821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 64899136 + 63920025 = 8056^2 + 7995^2 .

It is a cyclic number.

It is not a de Polignac number, because 128819161 - 2³ = 128819153 is a prime.

It is equal to p_7314994 and since 128819161 and 7314994 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 128819161.

It is not a weakly prime, because it can be changed into another prime (128819191) 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, 64409580 + 64409581.

It is an arithmetic number, because the mean of its divisors is an integer number (64409581).

Almost surely, 2^128819161 is an apocalyptic number.

It is an amenable number.

128819161 is a deficient number, since it is larger than the sum of its proper divisors (1).

128819161 is an equidigital number, since it uses as much as digits as its factorization.

128819161 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6912, while the sum is 37.

The square root of 128819161 is about 11349.8529065358. The cubic root of 128819161 is about 505.0412161243.

It can be divided in two parts, 1288 and 19161, that added together give a square (20449 = 143²).

The spelling of 128819161 in words is "one hundred twenty-eight million, eight hundred nineteen thousand, one hundred sixty-one".