128638001 has 2 divisors, whose sum is σ = 128638002. Its totient is φ = 128638000.

The previous prime is 128637979. The next prime is 128638061. The reversal of 128638001 is 100836821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 126000625 + 2637376 = 11225^2 + 1624^2 .

It is a cyclic number.

It is not a de Polignac number, because 128638001 - 2¹⁴ = 128621617 is a prime.

It is not a weakly prime, because it can be changed into another prime (128638061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64319000 + 64319001.

It is an arithmetic number, because the mean of its divisors is an integer number (64319001).

Almost surely, 2^128638001 is an apocalyptic number.

It is an amenable number.

128638001 is a deficient number, since it is larger than the sum of its proper divisors (1).

128638001 is an equidigital number, since it uses as much as digits as its factorization.

128638001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2304, while the sum is 29.

The square root of 128638001 is about 11341.8693785460. The cubic root of 128638001 is about 504.8043564602.

The spelling of 128638001 in words is "one hundred twenty-eight million, six hundred thirty-eight thousand, one".