128556403 has 2 divisors, whose sum is σ = 128556404. Its totient is φ = 128556402.

The previous prime is 128556383. The next prime is 128556419. The reversal of 128556403 is 304655821.

It is a strong prime.

It is an emirp because it is prime and its reverse (304655821) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 128556403 - 2²⁵ = 95001971 is a prime.

It is not a weakly prime, because it can be changed into another prime (128556203) 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, 64278201 + 64278202.

It is an arithmetic number, because the mean of its divisors is an integer number (64278202).

Almost surely, 2^128556403 is an apocalyptic number.

128556403 is a deficient number, since it is larger than the sum of its proper divisors (1).

128556403 is an equidigital number, since it uses as much as digits as its factorization.

128556403 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 28800, while the sum is 34.

The square root of 128556403 is about 11338.2716054961. The cubic root of 128556403 is about 504.6975976017.

The spelling of 128556403 in words is "one hundred twenty-eight million, five hundred fifty-six thousand, four hundred three".