128725169 has 2 divisors, whose sum is σ = 128725170. Its totient is φ = 128725168.

The previous prime is 128725159. The next prime is 128725213. The reversal of 128725169 is 961527821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 78499600 + 50225569 = 8860^2 + 7087^2 .

It is an emirp because it is prime and its reverse (961527821) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 128725169 - 2⁸ = 128724913 is a prime.

It is a super-2 number, since 2×128725169² = 33140338268157122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (128725159) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64362584 + 64362585.

It is an arithmetic number, because the mean of its divisors is an integer number (64362585).

Almost surely, 2^128725169 is an apocalyptic number.

It is an amenable number.

128725169 is a deficient number, since it is larger than the sum of its proper divisors (1).

128725169 is an equidigital number, since it uses as much as digits as its factorization.

128725169 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 60480, while the sum is 41.

The square root of 128725169 is about 11345.7114805551. The cubic root of 128725169 is about 504.9183529735.

The spelling of 128725169 in words is "one hundred twenty-eight million, seven hundred twenty-five thousand, one hundred sixty-nine".