128199793 has 2 divisors, whose sum is σ = 128199794. Its totient is φ = 128199792.

The previous prime is 128199791. The next prime is 128199809. The reversal of 128199793 is 397991821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 120626289 + 7573504 = 10983^2 + 2752^2 .

It is a cyclic number.

It is not a de Polignac number, because 128199793 - 2¹ = 128199791 is a prime.

Together with 128199791, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (128199791) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64099896 + 64099897.

It is an arithmetic number, because the mean of its divisors is an integer number (64099897).

Almost surely, 2^128199793 is an apocalyptic number.

It is an amenable number.

128199793 is a deficient number, since it is larger than the sum of its proper divisors (1).

128199793 is an equidigital number, since it uses as much as digits as its factorization.

128199793 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 244944, while the sum is 49.

The square root of 128199793 is about 11322.5347427155. The cubic root of 128199793 is about 504.2304955304.

The spelling of 128199793 in words is "one hundred twenty-eight million, one hundred ninety-nine thousand, seven hundred ninety-three".