128917903 has 2 divisors, whose sum is σ = 128917904. Its totient is φ = 128917902.

The previous prime is 128917883. The next prime is 128917939. The reversal of 128917903 is 309719821.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 128917903 - 2¹⁷ = 128786831 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128917303) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64458951 + 64458952.

It is an arithmetic number, because the mean of its divisors is an integer number (64458952).

Almost surely, 2^128917903 is an apocalyptic number.

128917903 is a deficient number, since it is larger than the sum of its proper divisors (1).

128917903 is an equidigital number, since it uses as much as digits as its factorization.

128917903 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27216, while the sum is 40.

The square root of 128917903 is about 11354.2019974985. The cubic root of 128917903 is about 505.1702239599.

The spelling of 128917903 in words is "one hundred twenty-eight million, nine hundred seventeen thousand, nine hundred three".