128950001 has 2 divisors, whose sum is σ = 128950002. Its totient is φ = 128950000.

The previous prime is 128949893. The next prime is 128950013. The reversal of 128950001 is 100059821.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 111851776 + 17098225 = 10576^2 + 4135^2 .

It is a cyclic number.

It is not a de Polignac number, because 128950001 - 2¹⁴ = 128933617 is a prime.

It is not a weakly prime, because it can be changed into another prime (128950061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64475000 + 64475001.

It is an arithmetic number, because the mean of its divisors is an integer number (64475001).

Almost surely, 2^128950001 is an apocalyptic number.

It is an amenable number.

128950001 is a deficient number, since it is larger than the sum of its proper divisors (1).

128950001 is an equidigital number, since it uses as much as digits as its factorization.

128950001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 720, while the sum is 26.

The square root of 128950001 is about 11355.6153950369. The cubic root of 128950001 is about 505.2121462684.

The spelling of 128950001 in words is "one hundred twenty-eight million, nine hundred fifty thousand, one".