128136403 has 2 divisors, whose sum is σ = 128136404. Its totient is φ = 128136402.

The previous prime is 128136401. The next prime is 128136451. The reversal of 128136403 is 304631821.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 128136403 - 2¹ = 128136401 is a prime.

Together with 128136401, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (128136401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64068201 + 64068202.

It is an arithmetic number, because the mean of its divisors is an integer number (64068202).

Almost surely, 2^128136403 is an apocalyptic number.

128136403 is a deficient number, since it is larger than the sum of its proper divisors (1).

128136403 is an equidigital number, since it uses as much as digits as its factorization.

128136403 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 128136403 is about 11319.7351117418. The cubic root of 128136403 is about 504.1473741253.

The spelling of 128136403 in words is "one hundred twenty-eight million, one hundred thirty-six thousand, four hundred three".