128307181 has 2 divisors, whose sum is σ = 128307182. Its totient is φ = 128307180.

The previous prime is 128307173. The next prime is 128307197. The reversal of 128307181 is 181703821.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 97337956 + 30969225 = 9866^2 + 5565^2 .

It is a cyclic number.

It is not a de Polignac number, because 128307181 - 2³ = 128307173 is a prime.

It is a super-2 number, since 2×128307181² = 32925465392333522, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128307121) 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, 64153590 + 64153591.

It is an arithmetic number, because the mean of its divisors is an integer number (64153591).

Almost surely, 2^128307181 is an apocalyptic number.

It is an amenable number.

128307181 is a deficient number, since it is larger than the sum of its proper divisors (1).

128307181 is an equidigital number, since it uses as much as digits as its factorization.

128307181 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2688, while the sum is 31.

The square root of 128307181 is about 11327.2759743903. The cubic root of 128307181 is about 504.3712476874.

The spelling of 128307181 in words is "one hundred twenty-eight million, three hundred seven thousand, one hundred eighty-one".