128012447 has 2 divisors, whose sum is σ = 128012448. Its totient is φ = 128012446.

The previous prime is 128012413. The next prime is 128012449. The reversal of 128012447 is 744210821.

It is a strong prime.

It is an emirp because it is prime and its reverse (744210821) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 128012447 - 2⁸ = 128012191 is a prime.

Together with 128012449, it forms a pair of twin primes.

It is a Chen prime.

It is equal to p_7271714 and since 128012447 and 7271714 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128012449) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64006223 + 64006224.

It is an arithmetic number, because the mean of its divisors is an integer number (64006224).

Almost surely, 2^128012447 is an apocalyptic number.

128012447 is a deficient number, since it is larger than the sum of its proper divisors (1).

128012447 is an equidigital number, since it uses as much as digits as its factorization.

128012447 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3584, while the sum is 29.

The square root of 128012447 is about 11314.2585704941. The cubic root of 128012447 is about 503.9847550923.

The spelling of 128012447 in words is "one hundred twenty-eight million, twelve thousand, four hundred forty-seven".