128681447 has 2 divisors, whose sum is σ = 128681448. Its totient is φ = 128681446.

The previous prime is 128681437. The next prime is 128681453. The reversal of 128681447 is 744186821.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 128681447 - 2¹⁸ = 128419303 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128681417) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64340723 + 64340724.

It is an arithmetic number, because the mean of its divisors is an integer number (64340724).

Almost surely, 2^128681447 is an apocalyptic number.

128681447 is a deficient number, since it is larger than the sum of its proper divisors (1).

128681447 is an equidigital number, since it uses as much as digits as its factorization.

128681447 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 86016, while the sum is 41.

The square root of 128681447 is about 11343.7845095894. The cubic root of 128681447 is about 504.8611806782.

The spelling of 128681447 in words is "one hundred twenty-eight million, six hundred eighty-one thousand, four hundred forty-seven".